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1 Have mercy upon me, O God, according to thy lovingkindness: according unto the multitude of thy tender mercies blot out my transgressions. 2 Wash me throughly from mine iniquity, and cleanse me from my sin. 3 For I acknowledge my transgressions: and my sin is ever before me. 4 Against thee, thee only, have I sinned, and done this evil in thy sight: that thou mightest be justified when thou speakest, and be clear when thou judgest. 5 Behold, I was shapen in iniquity; and in sin did my mother conceive me. 6 Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom. 7 Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow. 8 Make me to hear joy and gladness; that the bones which thou hast broken may rejoice. 9 Hide thy face from my sins, and blot out all mine iniquities. 10 Create in me a clean heart, O God; and renew a right spirit within me. 11 Cast me not away from thy presence; and take not thy holy spirit from me. 12 Restore unto me the joy of thy salvation; and uphold me with thy free spirit. 13 Then will I teach transgressors thy ways; and sinners shall be converted unto thee. 14 Deliver me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall sing aloud of thy righteousness. 15 O Lord, open thou my lips; and my mouth shall shew forth thy praise. 16 For thou desirest not sacrifice; else would I give it: thou delightest not in burnt offering. 17 The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise. 18 Do good in thy good pleasure unto Zion: build thou the walls of Jerusalem. 19 Then shalt thou be pleased with the sacrifices of righteousness, with burnt offering and whole burnt offering: then shall they offer bullocks upon thine altar.
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[AD 348] Pachomius the Great on Psalms 51:1-4
As the holy old man Pachomius was journeying to his own monastery and had come near the desert called Amnon, legions of demons rose both on his right hand and on his left, some following him and others running in front of him, saying, “Behold the blessed man of God.” They were doing this, wishing to sow vainglory in him. But he knew their cunning, and the more they shouted, the more he cried out to God, confessing his sins. And undoing the demons’ cunning, he spoke out to them, saying, “O wicked ones! You cannot carry me away with you into vainglory, for I know my failures, for which I ought to weep constantly over eternal punishment. I have therefore no need of your false speech and guileful deceit, for your work is the destruction of the soul. And I am not carried away by your praises, for I know the cunning of your unholy minds.” And although holy Pachomius said these things to them, they did not stop their shamelessness; they followed alongside the blessed man until he drew near his monastery.

Source: PARALIPOMENA 8:14
[AD 397] Ambrose of Milan on Psalms 51:1-4
“I [the prodigal son] have sinned,” he says, “against heaven and before you.” He confesses what is clearly a sin to death, that you may not think that any one doing penance is rightly shut out from pardon. For one who has sinned against heaven has sinned either against the kingdom of heaven or against his own soul, which is a sin to death, and against God, to whom alone is said: “Against you only have I sinned and done evil before you.”

Source: Concerning Repentance 2.3.17
[AD 407] John Chrysostom on Psalms 51:1-4
Beloved, let us praise her, through whom we have been saved. Let us love her; let us prefer her to wealth. Let us have a merciful soul apart from wealth. Nothing is more characteristic of a Christian than mercy. There is nothing that unbelievers and all people are so amazed at as when we are merciful. For we ourselves are often in need of this mercy and say to God, “Have mercy on us according to the greatness of your mercy.” Let us begin first ourselves; yet we do not begin first. For he has already shown his mercy that he has toward us. But, beloved, let us follow second. For if people have mercy on one who was merciful, even if he has committed countless sins, God is much more merciful.

Source: ON THE EPISTLE TO THE HEBREWS 32:3
[AD 420] Jerome on Psalms 51:1-4
Psalm 50 [51] shows the complete repentance of a sinner when David, who had gone into Bathsheba, the wife of Uriah the Hittite and was rebuked by the prophet Nathan, said, “I have sinned.” Immediately he deserved to hear “The Lord has removed your sin from you.” For he, who had added homicide to adultery and was moved to tears, said, “God, have compassion on me according to your great pity, and according to the multitude of your mercies take away my iniquity.” Since a great sin needed great mercy, he added, “Wash me completely from my iniquity, and my offense is always before me. I have sinned against you only”—for a king did not fear anyone else—“and I have done evil in your sight so that you will be justified in your speaking and you overcome when you judge.” “For God has included all things under sin so that he may be merciful to all.” He made so much progress that he who a little earlier had been a penitent sinner became a master and was able to say, “I will teach the unjust your ways, and sinners will be converted to you.” Since confession and beauty are before God, the one who confesses his sins and says, “My wounds have been destroyed and become putrefied,” changes the foulness of his wounds into a healthy state. But “he who hides his sins will not prosper.”

Source: LETTER 122.3
[AD 430] Augustine of Hippo on Psalms 51:1
Hear therefore these words, and say thou with him: "Have pity upon me, O God, after Your great mercy" [Psalm 51:1]. He that implores great mercy, confesses great misery. Let them seek a little mercy of You, that have sinned in ignorance: "Have pity," he says, "upon me, after Your great mercy." Relieve a deep wound after Your great healing. Deep is what I have, but in the Almighty I take refuge. Of my own so deadly wound I should despair, unless I could find so great a Physician. "Have pity upon me, O God, after Your great mercy: and after the multitude of Your pities, blot out my iniquity." What he says, "Blot out my iniquity," is this, "Have pity upon me, O God." And what he says, "After the multitude of Your pities," is this, "After Your great mercy." Because great is the mercy, many are the mercies; and of Your great mercy, many are Your pitying. Thou dost regard mockers to amend them, dost regard ignorant men to teach them, dost regard men confessing to pardon. Did he this in ignorance? A certain man had done some, aye many evil things he had done; "Mercy," he says, "I obtained, because ignorant I did it in unbelief." [1 Timothy 1:13] This David could not say, "Ignorant I did it." For he was not ignorant how very evil a thing was the touching of another's wife, and how very evil a thing was the killing of the husband, who knew not of it, and was not even angered. They obtain therefore the mercy of the Lord that have in ignorance done it; and they that have knowing done it, obtain not any mercy it may chance, but "great mercy."

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:1-4
As we were singing of the Lord, we asked him to turn his face away from our sins and to blot out all our misdeeds. But you can also take note, brothers, of what we heard in the same psalm: “Since I myself acknowledge my misdeed, and my sin is always before me.” Now somewhere else he says to God, “Do not turn your face away from me,” while here we have just said to him, “Turn your face away from my sins.” So since man17 and sinner are one person, the man says, “Do not turn your face away from me,” while the sinner says, “Turn your face away from my sins.” So what it amounts to is: “Do not turn your face away from what you have done; turn your face away from what I have done. Let your eye,” he says, “distinguish between them, or else the nature may perish because of the flaw. You have done something, I too have done something. What you have done is called nature; what I have done is called a flaw. May the flaw be remedied and thus the nature preserved.”

Source: SERMON 19:1
[AD 500] Desert Fathers on Psalms 51:1
Some monks called Euchites, or ‘men of prayer’, once came to Lucius in the ninth region of Alexandria. He asked them, ‘What manual work do you do?’ They said, ‘We do not work with our hands. We obey St Paul’s command and pray without ceasing’ (1 Thess. 5:17). He said to them, ‘Don’t you eat?’ They said, ‘Yes, we do.’ He said to them: ‘When you are eating who prays for you?’ Then he asked them, ‘Don’t you sleep?’ They said, ‘Yes, we do.’ He said, ‘Who prays for you while you are asleep?’ and they could not answer him. Then he said to them, ‘I may be wrong, brothers, but it seems to me that you don’t do what you say. I will show you how I pray without ceasing although I work with my hands. With God’s help, I sit down with a few palm leaves, and plait them, and say, ‘Have mercy upon me, O God, after thy great mercy: and according to the multitude of thy mercies do away with mine iniquity’ (Ps. 51:1). He asked them, ‘Is that prayer, or not?’ They said, ‘It’s prayer all right.’ He said, ‘When I spend all day working and praying in my heart, I make about sixteen pence. Two of these I put outside the door, and with the rest I buy food. Whoever finds the two pennies outside the door prays for me while I am eating and sleeping: and so by God’s grace I fulfil the text, “Pray without ceasing” (1 Thess. 5:17).’

Source: The Desert Fathers, Sayings of the Early Christian Monks
[AD 500] Desert Fathers on Psalms 51:1-4
Some monks called Euchites, or “men of prayer,” once came to Abba Lucius in the ninth region of Alexandria. And the old man asked them, “What work do you do with your hands?” And they said, “We do not work with our hands. We obey St. Paul’s command and pray without ceasing.” The old man said to them, “Do you not eat?” They said, “Yes, we eat.” And the old man said to them, “When you are eating, who prays for you?” Again, he asked them, “Do you not sleep?” They said, “We sleep.” And the old man said, “Who prays for you while you are asleep?” They would not answer him. And he said to them, “Forgive me, brothers, but you do not practice what you say. I will show you how I pray without ceasing though I work with my hands. With God’s help, I sit and collect a few palm leaves, and interweave them and say, ‘Have mercy on me, O God, according to your great mercy: and according to the multitude of your mercies do away with my iniquity.’ ” And he said to them, “Is that prayer, or is it not?” They said, “It is prayer.”

Source: SAYINGS OF THE FATHERS 12:9
[AD 533] Fulgentius of Ruspe on Psalms 51:1-4
Finally, holy David successfully gained divine mercy because, having been converted by the humility of a contrite heart, he condemned the evil he had done by acknowledging it and did not put off punishment by doing penance for the lust of the evil deed he had fallen into; because, if he had not punished the cause of the guilt in which he was held, without a doubt he would have been punished. Having been converted to penance, he acknowledged his crime, fearing lest he would have to acknowledge the penalty by being condemned. By doing penance, he punished himself by acknowledging what he wanted to be overlooked by the Lord in himself. Finally, since he said, “Have mercy on me, O God, according to your steadfast love; according to your abundant mercy blot out my transgressions. Wash me thoroughly from my iniquity, and cleanse me from my sin.” Immediately following this he added, “For I know my transgressions, and my sin is ever before me.” He acknowledged his sin, not that by sinning he might increase it the more, but that by repenting, he might wash it away; and so the domination of sin, which blameworthy enjoyment had brought in, true conversion removed. And because David, converted with all his heart, groaned, he was immediately saved and thus in him was fulfilled what is commanded through the prophet: “If you are converted and groan, you will be saved.”

Source: ON THE FORGIVENESS OF SINS 1:12.3
[AD 585] Cassiodorus on Psalms 51:1-4
“Who can understand his sins? Cleanse me from my hidden faults, O Lord.” See, the door of the third section opens, in which the prophet implores that all his sins would be washed away until the eloquence of his mouth would be rendered acceptable in the sight of the Lord. But because transgressions occur by means of human errors in three manners—thought, word and deed—he attests that that immense sea of sins, condensed in brevity, originates from two sources. The “hidden” sin is that which is called “original,” in which we are conceived, born and sin by a secret will, such as when we covet our neighbor’s property, when we desire to take vengeance on our enemies, when we want to be exalted above others, when we seek after tastier foods, and do things similar to these things. They sprout up and quietly seize us in such a way that they seem to be hidden to many until the deed is done. But if these things should be rendered visible to someone—as Solomon warns, “Do not go after your evil desires”20—we nonetheless ought to notice that there are many sins which we altogether do not know, of which we are able to understand neither their origins nor their manners of snatching us away. One must understand the phrase “Who understands all his sins?” from this perspective, because when he will go on to say in Psalm 51, “My sin is always before me” and elsewhere, “I have made my sin known to you,” how can it not be understood that whenever he sins he is compelled to confess? But if you add the word “all,” then this objection is shown to be obviated.

Source: EXPOSITIONS OF THE PSALMS 18:13
[AD 430] Augustine of Hippo on Psalms 51:2
"More and more wash me from mine unrighteousness" [Psalm 51:2]. What is, "More and more wash"? One much stained. More and more wash the sins of one knowing. Thou that hast washed off the sins of one ignorant. Not even thus is it to be despaired of Your mercy. "And from my delinquency purge Thou me." According to the manner in which He is physician, offer a recompense. He is God, offer sacrifice. What will you give that you may be purged? For see upon whom you call, upon a Just One you call. He hates sins, if He is just; He takes vengeance upon sins, if He is just; you will not be able to take away from the Lord God His justice: entreat mercy, but observe the justice: there is mercy to pardon the sinner, there is justice to punish the sin. What then? Thou ask mercy; shall sin unpunished abide? Let David answer, let those that have fallen answer, answer with David, and say, No, Lord, no sin of mine shall be unpunished; I know the justice of Him whose mercy I ask: it shall not be unpunished, but for this reason I will not that Thou punish me, because I punish my sin: for this reason I beg that Thou pardon, because I acknowledge.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:3
"For mine iniquity I acknowledge, and my delinquency is before me ever" [Psalm 51:3]. I have not put behind my back what I have done, I look not at others, forgetful of myself, I pretend not to pull out a straw from my brother's eye, when there is a beam in my eye; [Matthew 7:5] my sin is before me, not behind me. For it was behind me when to me was sent the Prophet, and set before me the parable of the poor man's sheep. For says Nathan the Prophet to David, "There was a certain rich man having very many sheep; but a poor man his neighbour had one little ewe sheep, which in his bosom and of his own food he was feeding: there came a stranger to the rich man, nothing from his flock he took, for the lithe ewe sheep of the poor man his neighbour he lusted; her he slew for the stranger: what does he deserve?" But the other being angry does pronounce sentence: then the king, evidently knowing not wherein he had been taken, declared the rich man deserving of death, and that the sheep be restored fourfold. Most sternly and most justly. But his sin was not yet before him, behind his back was what he had done: his own iniquity he did not yet acknowledge, and therefore another's he did not pardon. But the Prophet, being for this purpose sent, took from his back the sin, and before his eyes placed it, so that he might see that sentence so stern to have been pronounced against himself. For cutting and healing his heart's wound, he made a lancet of his tongue....

Source: Exposition on Psalm 51
[AD 56] Romans on Psalms 51:4
What advantage then hath the Jew? or what profit is there of circumcision? Much every way: chiefly, because that unto them were committed the oracles of God. For what if some did not believe? shall their unbelief make the faith of God without effect? God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged. [Psalms 51:4] But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man) God forbid: for then how shall God judge the world? For if the truth of God hath more abounded through my lie unto his glory; why yet am I also judged as a sinner? And not rather, (as we be slanderously reported, and as some affirm that we say,) Let us do evil, that good may come? whose damnation is just.
[AD 430] Augustine of Hippo on Psalms 51:4
"Against You alone have I sinned, and before You an evil thing have I done" [Psalm 51:4]. What is this? For before men was not another's wife debauched and husband slain? Did not all men know what David had done? [2 Samuel 11:4, 15] What is, "Against You alone have I sinned, and before You an evil thing have I done." Because You alone are without sin. He is a just punisher that has nothing in Him to be punished; He is a just reprover that has nothing in Him to be reproved. "That you may be justified in Your sayings, and conquer when You are judged." To whom he speaks, brethren, to whom he speaks, is difficult to understand. To God surely he speaks, and it is evident that God the Father is not judged. What is, "And conquer when You are judged"? He sees the future Judge to be judged, one just by sinners to be judged, and therein conquering, because in Him was nothing to be judged. For alone among men could truly say the God-Man, "If you have found in Me sin, say." [John 8:46] But perchance there was what escaped men, and they found not what was really there, but was not manifest. In another place [John 14:30] He says, "Behold there comes the Prince of the world," being an acute observer of all sins; "Behold," He says, "there comes the Prince of this world," with death afflicting sinners, presiding over death: for, "By the malice of the devil death came into the world." [Wisdom 2:24] "Behold," He says, "there comes the Prince of the world:"— He said these words close upon His Passion:— "and in Me he shall find nothing," nothing of sin, nothing worthy of death, nothing worthy of condemnation. And as if it were said to Him, Why then do You die? He continues and says, "But that all men may know that I do the will of My Father; arise, let us go hence." I suffer, He says, undeserving, for men deserving, in order that them I may make deserving of My Life, for whom I undeservedly suffer their death. To Him then, having no sin, says on the present occasion the Prophet David, "Against You only have I sinned, and before You an evil thing have I done, that You may be justified in Your sayings, and conquer when You are judged." For Thou overcomest all men, all judges; and he that deems himself just, before You is unjust: Thou alone justly judgest, having been unjustly judged, That hast power to lay down Your life, and hast power again to take it. [John 10:18] Thou conquerest, then, when You are judged. All men Thou overcomest, because You are more than men, and by You were men made.

Source: Exposition on Psalm 51
[AD 253] Origen of Alexandria on Psalms 51:5-9
Celsus has not explained how error accompanies the “becoming,” or product of generation; nor has he expressed himself with sufficient clearness to enable us to compare his ideas with ours and to pass judgment on them. But the prophets, who have given some wise suggestions on the subject of things produced by generation, tell us that a sacrifice for sin was offered even for newborn infants, as not being free from sin. They say, “I was shaped in iniquity, and in sin did my mother conceive me”; also, “They are estranged from the womb”; which is followed by the singular expression, “They go astray as soon as they are born, speaking lies.”

Source: AGAINST CELSUS 7:50
[AD 397] Ambrose of Milan on Psalms 51:5-9
After this white robes were given to you as a sign that you were putting off the covering of sins and putting on the chaste veil of innocence, of which the prophet said, “Purge me with hyssop, and I shall be cleansed; wash me, and I shall be made whiter than snow.” For one who is baptized is seen to be purified according to the law and according to the gospel: according to the law, because Moses sprinkled the blood of the lamb with a bunch of hyssop; according to the gospel, because Christ’s garments were white as snow, when in the Gospel he showed forth the glory of his resurrection. One, then, whose guilt is forgiven is made whiter than snow. Thus God said through Isaiah: “Though your sins are as scarlet, I will make them white as snow.”

Source: On the Mysteries 7:34
[AD 420] Jerome on Psalms 51:5-9
But we, according to the epistle of James, “all stumble in many things,” and “no one is pure from sin, no not if his life is but a day long.” For who will boast “that he has a clean heart? or who will be sure that he is pure from sin?” And we are held guilty after the likeness of Adam’s transgression. Hence David says, “Behold, I was shaped in iniquity, and in sin did my mother conceive me.” And the blessed Job, “Even if I were righteous, my mouth will speak wickedness; even if I were perfect, I will be found guilty. If I wash myself with soap and make my hands ever so clean, yet you will plunge me in the ditch, and even my own clothes will abhor me.”

Source: Against Jovinianus 2.2
[AD 420] Jerome on Psalms 51:5-9
I need not go through the lives of the saints or call attention to the moles and blemishes that mark the fairest skins. Many of our writers, it is true, unwisely take this course; however, a few sentences of Scripture will dispose alike of the heretics and the philosophers. What does Paul say? “For God has imprisoned all in disobedience so that he may be merciful to all”; and in another place, “All have sinned and come short of the glory of God.” The preacher also who is the mouthpiece of the divine Wisdom freely protests and says, “There is not a just person on earth, that does good and sins not,” and again, “When your people sin against you—for there is no one who does not sin,” and “who can say, I have made my heart clean?” and “none is clean from stain, not even if his life on earth has been but for one day.” David insists on the same thing when he says, “Behold, I was shaped in iniquity, and in sin did my mother conceive me”; and in another psalm, “in your sight shall no man living be justified.” This last passage they try to explain away from motives of reverence, arguing that the meaning is that no human being is perfect in comparison with God. Yet the Scripture does not say, “in comparison with you no one living shall be justified” but “in your sight no one living shall be justified.” And when it says “in your sight” it means that those who seem holy to people are by no means holy to God in his fuller knowledge. For “man looks on the outward appearance, but the Lord looks on the heart.” But if in the sight of God who sees all things and to whom the secrets of the heart lie open42 no one is just; then these heretics, instead of adding to human dignity, clearly take away from God’s power. I might bring together many other passages of Scripture of the same import; but were I to do so, I should exceed the limits not of a letter but of a volume.

Source: LETTER 133.2
[AD 430] Augustine of Hippo on Psalms 51:5
"For, behold, in iniquities I was conceived" [Psalm 51:5]. As though he were saying, They are conquered that have done what thou, David, hast done: for this is not a little evil and little sin, to wit, adultery and man-slaying. What of them that from the day that they were born of their mother's womb, have done no such thing? Even to them do you ascribe some sins, in order that He may conquer all men when He begins to be judged. David has taken upon him the person of mankind, and has heeded the bonds of all men, has considered the offspring of death, has adverted to the origin of iniquity, and he says, "For, behold, in iniquities I was conceived." Was David born of adultery; being born of Jesse, [1 Samuel 16:18] a righteous man, and his own wife? What is it that he says himself to have been in iniquity conceived, except that iniquity is drawn from Adam? Even the very bond of death, with iniquity itself is engrained? No man is born without bringing punishment, bringing desert of punishment. A Prophet says also in another place, "No one is clean in Your sight, not even an infant, whose life is of one day upon earth." For we know both by the Baptism of Christ that sins are loosed, and that the Baptism of Christ avails the remission of sins. If infants are every way innocent, why do mothers run with them when sick to the Church? What by that Baptism, what by that remission is put away? An innocent one I see that rather weeps than is angry. What does Baptism wash off? What does that Grace loose? There is loosed the offspring of sin. For if that infant could speak to you, it would say, and if it had the understanding which David had, it would answer you, Why do you heed me, an infant? Thou dost not indeed see my actions: but I in iniquity have been conceived, "And in sins has my mother nourished me in the womb."

Apart from this bond of mortal concupiscence was Christ born without a male, of a virgin conceiving by the Holy Ghost. He cannot be said to have been conceived in iniquity, it cannot be said, In sins His mother nourished Him in the womb, to whom was said, "The Holy Ghost shall come upon you, and the Virtue of the Highest shall overshadow you." [Luke 1:35] It is not therefore because it is sin to have to do with wives that men are conceived in iniquity, and in sins nourished in the womb by their mother; but because that which is made is surely made of flesh deserving punishment. For the punishment of the flesh is death, and surely there is in it liability to death itself. Whence the Apostle spoke not of the body as if to die, but as if dead: "The body indeed is dead," he says, "because of sin, but the Spirit is life because of righteousness." [Romans 8:10] How then without bond of sin is born that which is conceived and sown of a body dead because of sin? This chaste operation in a married person has not sin, but the origin of sin draws with it condign punishment. For there is no husband that, because he is an husband, is not subject to death, or that is subject to death for any other reason but because of sin. For even the Lord was subject to death, but not on account of sin: He took upon Him our punishment, and so looses our guilt. With reason then, "In Adam all die, but in Christ shall all be made alive." [1 Corinthians 15:22] For, "Through one man," says the Apostle, "sin has entered into this world, and through sin death, and so has passed unto all men, in that all have sinned." [Romans 5:12] Definite is the sentence: "In Adam," he says, "all have sinned." Alone then could such an infant be innocent, as has not been born of the work of Adam.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:5-9
So it is because of this quite unique innocence that the psalm says, “Against you alone have I sinned and done what is evil in your presence, that you may be justified in your words and may overcome when you are judged,” because he could find not a hint of evil in you [Jesus Christ]. Why could he find it in you, though, O human race? Because it goes on to say, “For I myself was conceived in iniquity, and in sins did my mother conceive me.” It is David saying this. Inquire how David was born; you will discover that it was of a lawful wife, not of adultery. So in terms of what sort of propagation does he say “I was conceived in iniquity”? It can only be that there is here a kind of propagation or transmission of death, which every person contracts who is born of the union of man and woman.

Source: SERMON 170:4
[AD 430] Augustine of Hippo on Psalms 51:5-9
So all past sins are forgiven people on conversion; but for the rest of this life there are certain grave and deadly sins, from which one can be released only by the most vehement and distressing humbling of the heart and contrition of spirit and the pain of repentance. These are forgiven through the keys of the church. If you start judging yourself, you see, if you start being displeased with yourself, God will come along to show you mercy. If you are willing to punish yourself, he will spare you. In fact, all who repent and do penance well are punishing themselves. They have to be severe with themselves, so that God may be lenient with them. As David says, “Turn your face away from my sins, and blot out all my iniquities.” But on what terms? He says in the same psalm, “Since I acknowledge my iniquity, and my sin is always before me.” So if you acknowledge it, God overlooks it.

Source: SERMON 278:12
[AD 430] Augustine of Hippo on Psalms 51:5-9
God does not listen to sinners. When he was beating his breast, he was punishing his sins; when he was punishing his sins, he was associating himself with God as judge. God, you see, hates sins; if you too hate them, you are beginning to join God, so that you can say to him, “Turn your face away from my sins.” Turn your face away—but from what? From my sins. “Do not turn your face away from me.” What’s the meaning of “your face from my sins”? Don’t see them, don’t look at them; overlook them instead, so that you can pardon me.

Source: SERMON 136A.2
[AD 430] Augustine of Hippo on Psalms 51:6
"For, behold, truth You have loved: uncertain and hidden things of Your wisdom, You have manifested to me" [Psalm 51:6]. That is, You have not left unpunished even the sins of those whom Thou dost pardon. "Truth You have loved:" so mercy You have granted first, as that You should also preserve truth. Thou pardonest one confessing, pardonest, but only if he punishes himself: so there are preserved mercy and truth: mercy because man is set free; truth, because sin is punished. "Uncertain and hidden things of Your wisdom You have manifested to me." What "hidden things"? What "uncertain things"? Because God pardons even such. Nothing is so hidden, nothing so uncertain. For this uncertainty the Ninevites repented, for they said, though after the threatenings of the Prophet, though after that cry, "Three days and Nineve shall be overthrown:" [Jonah 3:4] they said to themselves, Mercy must be implored; they said in this sort reasoning among themselves, "Who knows whether God may turn for the better His sentence, and have pity?" [Jonah 3:9] It was "uncertain," when it is said, "Who knows?" on an uncertainty they did repent, certain mercy they earned: they prostrated them in tears, in fastings, in sackcloth and ashes they prostrated them, groaned, wept, God spared. Nineve stood: was Nineve overthrown? One way indeed it seems to men, and another way it seemed to God. But I think that it was fulfilled that the Prophet had foretold. Regard what Nineve was, and see how it was overthrown; overthrown in evil, built in good; just as Saul the persecutor was overthrown, Paul the preacher built. [Acts 9:4] Who would not say that this city, in which we now are, was happily overthrown, if all those madmen, leaving their triflings, were to run together to the Church with contrite heart, and were to call upon God's mercy for their past doings? Should we not say, Where is that Carthage? Because there is not what there was, it is overthrown: but if there is what there was not, it is built. So is said to Jeremiah, "Behold, I will give to you to root up, to dig under, to overthrow, to destroy," and again, "to build, and to plant." [Jeremiah 1:10] Thence is that voice of the Lord, "I will smite and I will heal." [Deuteronomy 32:39] He smites the rottenness of the deed, He heals the pain of the wound. Physicians do thus when they cut; they smite and heal; they arm themselves in order to strike, they carry steel, and come to cure. But because great were the sins of the Ninevites, they said, "Who knows?" This uncertainty had God disclosed to His servant David. For when he had said, before the Prophet standing and convicting him, "I have sinned:" straightway he heard from the Prophet, that is, from the Spirit of God which was in the Prophet, "Your sin is put away from you." [2 Samuel 12:13] "Uncertain and hidden things" of His wisdom He manifested to him.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:7
"You shall sprinkle me," he says, "with hyssop, and I shall be cleansed" [Psalm 51:7]. Hyssop we know to be a herb humble but healing: to the rock it is said to adhere with roots. Thence in a mystery the similitude of cleansing the heart has been taken. Do thou also take hold, with the root of your love, on your Rock: be humble in your humble God, in order that you may be exalted in your glorified God. You shall be sprinkled with hyssop, the humility of Christ shall cleanse you. Despise not the herb, attend to the efficacy of the medicine. Something further I will say, which we are wont to hear from physicians, or to experience in sick persons. Hyssop, they say, is proper for purging the lungs. In the lung is wont to be noted pride: for there is inflation, there breathing. It was said of Saul the persecutor as of Saul the proud, that he was going to bind Christians, breathing slaughter: [Acts 9:1] he was breathing out slaughter, breathing out blood, his lung not yet cleansed. Hear also in this place one humbled, because with hyssop purged: "You shall wash me," that is, shall cleanse me: "and above snow I shall be whitened." "Although," he says, "your sins shall have been like scarlet, like snow I will whiten." [Isaiah 1:18] Out of such men Christ does present to Himself a vesture without spot and wrinkle. [Ephesians 5:27] Further, His vesture on the mount, which shone forth like whitened snow, [Matthew 17:2] signified the Church cleansed from every spot of sin.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:8
But where is humility from hyssop? Hear what follows: "To my hearing You shall give exultation and gladness, and bones humbled shall exult" [Psalm 51:8]. I will rejoice in hearing You, not in speaking against You. You have sinned, why defendest you yourself? You will speak: suffer thou; hear, yield to divine words, lest you be put to confusion, and be still more wounded: sin has been committed, be it not defended: to confession let it come, not to defence. Thou engagest yourself as defender of your sin, you are conquered: no innocent patron have you engaged, your defence is not profitable to you. For who are you that defendest yourself? You are meet to accuse yourself. Say not, either, "I have done nothing;" or, "What great thing have I done?" or, "Other men as well have done." If in doing sin you say you have done nothing, you will be nothing, you will receive nothing: God is ready to give indulgence, you close the door against yourself: He is ready to give, do not oppose the bar of defence, but open the bosom of confession. "To my hearing You shall give exultation and gladness."...

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:9
"Turn Thou away Your face from my sins, and all mine iniquities blot out" [Psalm 51:9]. For now bones humbled exult, now with hyssop cleansed, humble I have become. "Turn Thou away Your face," not from me, but "from my sins." For in another place praying he says, "Turn not away Your face from me." He that would not that God's face be turned away from himself, would that God's face be turned away from his sins. For to sin, when God turns not Himself away, he adverts: if he adverts, he animadverts. "And all mine iniquities blot out." He is busied with that capital sin: he reckons on more, he would have all his iniquities to be blotted out: he relies on the Physician's hand, on that "great mercy," upon which he has called in the beginning of the Psalm: "All mine iniquities blot out." God turns away His face, and so blots out; by "turning away" His face, sins He blots out. By "turning towards," He writes them. You have heard of Him blotting out by turning away, hear of Him by turning towards, doing what? "But the countenance of the Lord is upon men doing evil things, that He may destroy from the earth the remembrance of them:" He shall destroy the remembrance of them, not by "blotting out their sins." But here he does ask what? "Turn away Your face from my sins." Well he asks. For he himself does not turn away his face from his own sins, saying, "For my sin I acknowledge." With reason you ask and well ask, that God turn away from your sin, if you from thence dost not turn away your face: but if you set your sin at your back, God does there set His face. Do thou turn sin before your face, if you will that God thence turn away His face; and then safely you ask, and He hears.

Source: Exposition on Psalm 51
[AD 223] Callistus I of Rome on Psalms 51:10-14
People are in error who think that the priests of the Lord, after a lapse, although they may have exhibited true repentance, are not capable of ministering to the Lord and engaging their honorable offices, even though they may lead a good life thereafter and perform their priesthood correctly. Individuals who hold this opinion are not only in error but also seem to argue and act in opposition to the power of the keys committed to the church, of which it is said, “Whatever you shall loose on earth shall be loosed in heaven.” In short, this opinion either is not the Lord’s or it is true. Be that as it may, we believe without hesitation that both the priests of the Lord and other believers may return to their place of honor after a proper satisfaction for their error, as the Lord testifies through his prophet: “Shall he who falls not also rise again? and shall he who turns away not return?” In another passage the Lord says, “I desire not the death of the sinner, but that he may turn and live.” The prophet David, on his repentance, said, “Restore to me the joy of your salvation, and uphold me with your free Spirit.” And he indeed, after his repentance, taught others also and offered sacrifice to God, giving thereby an example to the teachers of the holy church, that if they have fallen and thereafter have exhibited a right repentance to God, they may do both things in like manner. For he taught when he said, “I will teach transgressors your ways, and sinners will be converted to you.” And he offered sacrifice for himself when he said, “The sacrifice for God is a broken spirit.” For the prophet, seeing his own transgressions purged by repentance, had no doubt as to healing those of others by preaching and by making offering to God. Thus the shedding of tears moves the mind’s feeling (passionem). And when the satisfaction is made good, the mind is turned aside from anger. For how does that person think that mercy will be shown to himself, who does not forgive his neighbor? If offences abound, then, let mercy also abound; for with the Lord there is mercy, and with him is plentiful redemption.

Source: EPISTLE 2:6
[AD 235] Hippolytus of Rome on Psalms 51:10-14
This is the Spirit that at the beginning "moved upon the thee of the waters; " by whom the world moves; by whom creation consists, and all things have life; who also wrought mightily in the prophets, and descended in flight upon Christ. This is the Spirit that was given to the apostles in the form of fiery tongues. This is the Spirit that David sought when he said, "Create in me a clean heart, O God, and renew a right spirit within me." Of this Spirit Gabriel also spoke to the Virgin, "The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee." By this Spirit Peter spake that blessed word, "Thou art the Christ, the Son of the living God." By this Spirit the rock of the Church was stablished. This is the Spirit, the Comforter, that is sent because of thee, that He may show thee to be the Son of God.

Source: Hippolytus Dogmatical and Historical Fragments - The Discourse on the Holy Theophany
[AD 379] Basil of Caesarea on Psalms 51:10-14
We shall now examine what kinds of ideas about the Spirit we hold in common, as well as those that we have gathered from the Scriptures or received from the unwritten tradition of the Fathers. First of all, who can listen to the Spirit’s titles and not be lifted up in his soul? Whose thoughts would not be raised to contemplate the supreme nature? He is called the Spirit of God, the Spirit of truth who proceeds from the Father, right Spirit, willing Spirit. His first and most proper title is Holy Spirit, a name most especially appropriate to everything that is incorporeal, purely immaterial and indivisible.

Source: ON THE HOLY SPIRIT 9:22
[AD 390] Gregory of Nazianzus on Psalms 51:10-14
In addition to what has already been said, those who cleanse the head, which is the seat of knowledge, would do well to hold fast to Christ as their head. It is from him that the entire body is joined together and reconciled. And to cast aside our sin which arises and to seek to surpass the better part. It is also good that they should cleanse the shoulder so that it will be able to bear the cross of Christ, which is not borne easily by everyone. It is also good to consecrate the hands and the feet—the hands so that they may be lifted up in every holy place and grasp the teachings of Christ lest the Lord be angered at any time and to believe the Word by living it as when it was given into the hand of the prophet; the feet so that they will not be quick to shed blood or rush into evil but that they may be ready to hurry to the gospel and to their high calling and to receive Christ, who washes and purifies them. If anyone is clean in his stomach, which is able to hold and digest the food of the Word, he should not make a god of nourishment and meat that perishes; rather he should especially reduce its size so that he may receive the Word of the Lord in its very midst and to grieve deeply over the failing of Israel. I also find the heart and the inward parts worthy of honor. David convinced me of this when he asked that a clean heart be created within him and a right spirit be consecrated in his innermost being—by this I think he clearly means his mind and its emotions or thoughts.

Source: ON HOLY BAPTISM, ORATION 40:39
[AD 407] John Chrysostom on Psalms 51:10-14
It would be better to be defiled with unclean mud than with sins. A person who is defiled with mud can wash it off in a short time and become like one who had never fallen into that mire at all. But one who has fallen into the deep pit of sin has contracted a defilement that is not cleansed by water but needs a long period of time, strict repentance, tears and lamentations and more wailing—and that more fervent than we show at the loss of one of our dearest friends. For this defilement attaches to us from without, wherefore we also quickly put it away, but the other is generated from within, where it is more difficult to wash it off and to cleanse ourselves from it. “For from the heart” (it is said) “proceed evil thoughts, fornications, adulteries, thefts, false witnesses.” Thus, the prophet also said, “Create in me a clean heart, O God.” And another prophet said, “Wash your heart from wickedness, O Jerusalem.” (You see that it is both our [work] and God’s.) And again, “Blessed are the pure in heart, for they shall see God.”

Source: ON THE EPISTLE TO THE HEBREWS 12:7
[AD 420] Jerome on Psalms 51:10-14
“The one who says, I know him, and does not keep his commandments is a liar, and the truth is not in him. But whoever keeps his word, in him the love of God has been truly perfected. By this we know that we are in him; he who says that he abides in him ought himself also to walk as he walked.” My reason for telling you, little children, that everyone who is born of God does not sin, is that you should not sin and that you should know that as long as you do not sin you abide in the birth37 that God has given you. Truly, they who abide in that birth cannot sin. “For what does light have in common with darkness? Or Christ with Belial?” As day is distinct from night, so righteousness and unrighteousness, sin and good works, Christ and Antichrist cannot blend. If we give Christ a lodging place in our hearts, we banish the devil therefrom. If we sin and the devil enters through the gate of sin, Christ will immediately withdraw. Hence David after sinning says, “Restore to me the joy of your salvation,” that is, the joy that he had lost by sinning.

Source: Against Jovinianus 2.2
[AD 430] Augustine of Hippo on Psalms 51:10
"A clean heart create in me, O God" [Psalm 51:10]. "Create"— he meant to say, "as it were begin something new." But, because repentant he was praying (that had committed some sin, which before he had committed, he was more innocent), after what manner he has said "create" he shows. "And a right spirit renew in my inner parts." By my doing, he says, the uprightness of my spirit has been made old and bowed. For he says in another Psalm, "They have bowed my soul." And when a man does make himself stoop unto earthly lusts, he is "bowed" in a manner, but when he is made erect for things above, upright is his heart made, in order that God may be good to him. For, "How good is the God of Israel to the upright of heart!" Moreover, brethren, listen. Sometimes God in this world chastises for his sin him that He pardons in the world to come. For even to David himself, to whom it had been already said by the Prophet, "Your sin is put away," [2 Samuel 12:13] there happened certain things which God had threatened for that very sin. For his son Abessalom against him waged bloody war, and many ways humbled his father. [2 Samuel 15:10] He was walking in grief, in the tribulation of his humiliation, so resigned to God, that, ascribing to Him all that was just, he confessed that he was suffering nothing undeservedly, having now an heart upright, to which God was not displeasing. A slanderous person and one throwing in his teeth harsh curses [2 Samuel 16:10] he patiently heard, one of the soldiers on the opposite side, that were with his unnatural son. And when he was heaping curses upon the king, one of the companions of David, enraged, would have gone and smitten him; but he is kept back by David. And he is kept back how? For that he said, God sent him to curse me. Acknowledging his guilt he embraced his penance, seeking glory not his own, praising the Lord in that good which he had, praising the Lord in that which he was suffering, "blessing the Lord always, ever His praise was in his mouth." Such are all the upright in heart: not those crooked persons who think themselves upright and God crooked: who when they do any evil thing, rejoice; when they suffer any evil thing, blaspheme; nay, if set in tribulation and scourging, they say from their distorted heart, "O God, what have I done to You?" Truly it is because they have done nothing to God, for they have done all to themselves. "And an upright spirit, renew in my inner parts."

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:10-14
We are then truly free when God ordered our lives, that is, formed and created us not as individuals—this he has already done—but also as good people, which he is now doing by his grace, that we may indeed be new creatures in Christ Jesus. Accordingly, the prayer “Create in me a clean heart, O God.” This does not mean, as far as the natural human heart is concerned, that God has not already created this.

Source: Enchiridion 9:31
[AD 430] Augustine of Hippo on Psalms 51:10-14
So then Rome, the head of the nations, has these two lights of the nations lit by the one who enlightens every person who comes into this world47—one light in which God has exalted the most abject lowliness, the other in which he cured the wickedness that deserved to be condemned. With the former let us learn not to be proud, with the latter not to despair. How simply these great examples have been set before us, and how salutary they are! Let us always commemorate them and in praising them glorify that true light. So none of us should get a swollen head about having a high position in the world; Peter was a fisherman. None of us, reflecting on our own iniquity, should run away from God’s mercy; Paul was a persecutor. The former says, “The Lord has become the refuge of the poor”;49 the latter says, “Let me teach the wicked your ways, and the godless will be converted to you.”

Source: SERMON 381:1
[AD 585] Cassiodorus on Psalms 51:10-14
As for the fact that he says, “And he has looked upon,” he indicates the grace of the one who shows mercy. We say that they see that we look upon those to whom we declare that something has also been offered. And consider that he did not say that the sins were seen, but rather the sons of men were. For when God looks at their sins, he punishes them; when he looks at a person, he absolves them, just as he will say in Psalm 51, “Turn your face from my sins,” and elsewhere, “Do not turn your face away from me.” Thus, we must understand and retain this salutary distinction.

Source: EXPOSITIONS OF THE PSALMS 32:13
[AD 735] Bede on Psalms 51:10-14
Let us call to mind that he promised that [Jesus] would send the grace of the Spirit to his disciples, and he did send it. And let us take care with all watchfulness, lest by our seductive thoughts we grieve the Holy Spirit of God, in whom we have been sealed for the day of redemption. For so it is written, “The Holy Spirit will flee the pretense of discipline, and will remove himself from thoughts that are without understanding.” When the psalmist was burning with the desire to receive this Spirit, he providently sought first [to have] the guest chamber of a clean heart in which he could receive him, and so at length [he] sought the entry of so great a guest. “Create a clean heart in me, O God,” he said, “renew an upright spirit in my inmost parts.” He entreated that first a clean heart be created in him and then that an upright spirit be renewed in his inmost parts, because he knew that an upright spirit could have no place in a defiled heart.

Source: Homilies on the Gospels 2:11
[AD 735] Bede on Psalms 51:10-14
It is only by participation in the divine goodness that a rational creature is recognized as being capable of becoming good. Hence the Lord also bears witness by a benevolent promise that “your Father from heaven will give his good Spirit to those who ask him.” This is to point out that those who of themselves are evil can become good through receiving the gift of the Spirit. He pledged that his good Spirit would be given by the Father to those asking for him, because whether we desire to secure faith, hope and charity, or any other heavenly goods at all, they are not bestowed on us in any other way than by the gift of the Holy Spirit. So it is that the same Spirit, in Isaiah, is named the Spirit of wisdom and understanding, the Spirit of counsel and fortitude, the Spirit of knowledge and piety, the Spirit of the fear of the Lord; and in another place, the Spirit of love and peace24 [and] the Spirit of grace and prayers. Undoubtedly whatever good we truly have, whatever we do well, this we receive from the lavishness of the same Spirit. When a prophet who understood this was seeking purity of heart, saying, “Create a pure heart in me, O Lord,” he immediately added, “Renew a steadfast spirit within me.” If the steadfast Spirit of the Lord does not fill our innermost being, we have no pure heart where he may abide. When in his eager longing for an advance in good for his work he had said, “Lord, I have had recourse to you, teach me to do your will,” he at once showed in what way he had to secure this when he went on, “Let your good Spirit lead me into the right way.”

Source: Homilies on the Gospels 2:14
[AD 430] Augustine of Hippo on Psalms 51:11
"Cast me not forth from Your face" [Psalm 51:11]. Turn away Your face from my sins: and "cast me not forth from Your face." Whose face he fears, upon the face of the Same he calls. "And Your Holy Spirit take not away from me." For in one confessing there is the Holy Spirit. Even now, to the gift of the Holy Spirit it belongs, that what you have done displeases you. The unclean spirit sins do please; the Holy One they displease. Though then thou still implore pardon, yet you are joined to God on the other part, because the evil thing that you have committed displeases you: for the same thing displeases both you and Him. Now, to assail your fever, you are two, thou and the Physician. For the reason that there cannot be confession of sin and punishment of sin in a man of himself: when one is angry with himself, and is displeasing to himself, then it is not without the gift of the Holy Spirit, nor does he say, Your Holy Spirit give to me, but, "Take not away from me."

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:12
"Give back to me the exultation of Your salvation" [Psalm 51:12]. "Give back" what I had; what by sinning I had lost: to wit, of Your Christ. For who without Him can be made whole? Because even before that He was Son of Mary, "In the beginning He was the Word, and the Word was with God, and the Word was God;" [John 1:1] and so, by the holy fathers a future dispensation of flesh taken upon Him, was looked for; as is believed by us to have been done. Times are changed, not faith. "And with Principal Spirit confirm me." Some have here understood the Trinity in God, Itself God; the dispensation of Flesh being excepted therefrom: since it is written, "God is a Spirit." [John 4:24] For that which is not body, and yet is, seems to exist in such sort as that it is spirit. Therefore some understand here the Trinity spoken of: "In upright Spirit," the Son; in "Holy Spirit," Holy Ghost; in "Principal Spirit," Father. It is not any heretical opinion, therefore, whether this be so, or whether "upright Spirit" He would have to be taken of man himself (when He says, "An upright spirit renew in my inner parts"), which I have bowed and distorted by sinning, so that in that case the Holy Spirit be Himself the Principal Spirit: which also he would not have to be taken away from him, and thereby would have himself to be confirmed therein.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:13
But see what he annexes: "With Principal Spirit," he says, "confirm Thou me." Wherein "confirm"? Because You have pardoned me, because I am secure, that what You have forgiven is not to be ascribed, on this being made secure and with this grace confirmed, therefore I am not ungrateful. But I shall do what? "I would teach unrighteous men Your ways" [Psalm 51:13]. Being myself of the unrighteous (that is, one that was myself an unrighteous man, now no longer unrighteous; the Holy Spirit not having been taken away from me, and I being confirmed with Principal Spirit). "I would teach unrighteous men Your ways." What ways will you teach unrighteous men? "And ungodly men to You shall be converted." If David's sin is counted for ungodliness, let not ungodly men despair of themselves, forasmuch as God has spared an ungodly man; but let them take heed that to Him they be converted, that His ways they learn. But if David's deed is not counted for ungodliness, but this is properly call ungodliness, namely, to apostatize from God, not to worship one God, or never to have worshipped, or to have forsaken, Him whom one did worship, then what he says has the force of superabundance, "And ungodly men shall to You be converted." So full are you of the fatness of mercy, that for those converted to You, not only sinners of any sort, but even ungodly, there is no cause for despair. Wherefore? That believing on Him that justifies an ungodly man, their faith may be counted for righteousness. [Romans 4:5]

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:14
"Deliver me from bloods, O God, God of my health" [Psalm 51:14]. The Latin translator has expressed, though by a word not Latin, yet an accuracy from the Greek. For we all know that in Latin, sanguines (bloods) are not spoken of, nor yet sanguina (bloods in the neuter), nevertheless because the Greek translator has thus used the plural number, not without reason, but because he found this in the original language the Hebrew, a godly translator has preferred to use a word not Latin, rather than one not exact. Wherefore then has he said in the plural number, "From bloods"? In many bloods, as in the origin of the sinful flesh, many sins he would have to be understood. The Apostle having regard to the very sins which come of the corruption of flesh and blood, says, "Flesh and blood shall not possess the kingdom of God." [1 Corinthians 15:50] For doubtless, after the true faith of the same Apostle, that flesh shall rise again and shall itself gain incorruption, as He says Himself, "This corruptible must put on incorruption, and this mortal put on immortality." [1 Corinthians 15:53] Because then this corruption is of sin, by the name thereof sins are called. In like manner as both that morsel of flesh and member which plays in the mouth when we articulate words is called a tongue, and that is called a tongue which by the tongue is made, so we call one tongue the Greek, another the Latin; for the flesh is not diverse, but the sound. In the same manner, then, as the speech which is made by the tongue is called a tongue; so also the iniquity which is made by blood is called blood. Heeding, then, his many iniquities, as in the expression above, "And all my iniquities blot out," and ascribing them to the corruption of flesh and blood, "Free me," he says, "from bloods:" that is, free me from iniquities, cleanse me from all corruption....Not yet is the substance, but certain hope. "And my tongue shall exult of Your righteousness."

Source: Exposition on Psalm 51
[AD 132] Epistle of Barnabas on Psalms 51:15-19
To us, therefore, David says, “A sacrifice to God is a broken heart”; “an aroma pleasing to the Lord is a heart that glorifies its Maker.” So, brothers, we ought to give very careful attention to our salvation, lest the evil one should cause some error to slip into our midst and thereby hurl us away from our life.

Source: EPISTLE OF BARNABAS 2:10
[AD 390] Gregory of Nazianzus on Psalms 51:15-19
I have not yet alluded to the true and first wisdom, for which our wonderful husbandman and shepherd is conspicuous. The first wisdom is a life worthy of praise, in which a person keeps himself pure for God or is purified for him who is all-pure and all-luminous. God demands of us, as his only sacrifice, purification—that is, a contrite heart, the sacrifice of praise, a new creation in Christ, the new man, and the like, as the Scripture loves to call it.

Source: ON HIS FATHER’S SILENCE, ORATION 16:2
[AD 407] John Chrysostom on Psalms 51:15-19
Other things too must be added to humbleness of mind if it is such as the blessed David knew, when he said, “A broken and a contrite heart God will not despise.” For that which is broken does not rise up, does not strike, but is ready to be ill-treated and itself does not rise up. Such is contrition of heart: though it is insulted, though it is enticed by evil, it is quiet and is not eager for vengeance.

Source: ON THE EPISTLE TO THE HEBREWS 9:8
[AD 407] John Chrysostom on Psalms 51:15-19
But how shall a person find grace with God? How else, except by lowliness of mind? For “God,” James says, “resists the proud but gives grace to the humble”; and “the sacrifice of God is a broken spirit, and a heart that is brought low God will not despise.” For if humility is so lovely to human beings, it is much more so with God. Thus both the Gentiles found grace and the Jews did not fall from grace in any other way, “for they were not subject to the righteousness of God.” The lowly person of whom I am speaking is pleasing and delightful to all people, and dwells in continual peace and has in him no ground for contentions. For even if you insult him, even if you abuse him, whatever you say, he will be silent and will bear it meekly; he will have so great a peace toward all people that one cannot even describe it. Yes, and with God also. For the commandments of God are to be at peace with human beings: and thus our whole life is made prosperous, through peace one with another.

Source: HOMILIES ON 1 CORINTHIANS 1:4
[AD 430] Augustine of Hippo on Psalms 51:15-19
At the time David spoke in this way: “Since if you had wanted a sacrifice I would certainly have given one; in burnt offerings you will not delight.” [However,] those sacrifices that were still offered to God are no longer offered now. He was prophesying, therefore, when he said this: he was rejecting current customs and foreseeing future ones. “In burnt offerings,” he says, “you will not delight. When you [the congregation] stop delighting in burnt offerings, will you be left without any sacrifice? Certainly not.” “A sacrifice to God is a contrite spirit: a contrite and humbled heart God does not despise.” Therefore you do have something to offer. Don’t look around the flock, don’t fit out ships and travel to far distant regions to bring back incense. Look in your own heart for what may be acceptable to God. The heart has to be crushed. Why be afraid it will be destroyed if you crush it? There you have the answer: “Create a clean heart in me, O God.” For a clean heart to be created, let the unclean heart be crushed.

Source: SERMON 19:3
[AD 430] Augustine of Hippo on Psalms 51:15-19
So this lad had already crushed his heart in a region afflicted with famine; I mean, he had returned to his heart to pound his heart; he had previously left his heart in pride; he had now returned to his heart in anger. He was angry with himself, ready to punish not himself but his wrongdoing; he had returned, ready to earn his father’s right response. He spoke in anger, according to the text, “Be angry, and do not sin.” Repentance, you see, always means being angry with yourself, seeing that because you are angry, you punish yourself. That is the source of all those gestures in penitents who are truly repentant, truly sorry; the source of tearing the hair, of wrapping oneself in sackcloth, of beating the breast. Surely these are all indications of being savage with oneself, being angry with oneself. What the hand does outwardly, the conscience does inwardly; it lashes itself in its thoughts, it beats itself, indeed, to speak more truly, it slays itself. It is by slaying itself, you see, that it offers itself “a sacrifice to God, a crushed spirit; a contrite and humbled heart God does not reject.” Just so, then, this lad by pounding, humbling, beating his heart, slew his heart.

Source: SERMON 112A.5
[AD 430] Augustine of Hippo on Psalms 51:15-19
No matter how great our crimes, forgiveness of them should never be despised in the holy church for those who truly repent, each according to the measure of his sin. And, in the act of repentance, where a crime has been committed of such gravity as also to cut off the sinner from the body of Christ, we should not consider the amount of time as much as the degree of sorrow. For “a contrite and humbled heart God will not despise.”

Source: Enchiridion 17:65
[AD 430] Augustine of Hippo on Psalms 51:15
"O Lord, my lips You shall open, and my mouth shall tell of Your praise" [Psalm 51:15]. "Your praise," because I have been created: "Your praise," because sinning I have not been forsaken: "Your praise," because I have been admonished to confess: "Your praise," because in order that I might be secured I have been cleansed.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:16-17
"Because if You had willed sacrifice, I would have given it surely" [Psalm 51:16]. David was living at that time when sacrifices of victim animals were offered to God, and he saw these times that were to be. Do we not perceive ourselves in these words? Those sacrifices were figurative, foretelling the One Saving Sacrifice. Not even we have been left without a Sacrifice to offer to God. For hear what he says, having a concern for his sin, and wishing the evil thing which he has done to be forgiven him: "If You had willed," he says, "sacrifice, I would have given it surely. With holocausts You will not be delighted." Nothing shall we therefore offer? So shall we come to God? And whence shall we propitiate Him? Offer; certainly in yourself you have what you may offer. Do not from without fetch frankincense, but say, "In me are, O God, Your vows, which I will render of praise to You." Do not from without seek cattle to slay, you have in yourself what you may kill. "Sacrifice to God is a spirit troubled, a heart contrite and humbled God despises not" [Psalm 51:17]. Utterly he despises bull, he-goat, ram: now is not the time that these should be offered. They were offered when they indicated something, when they promised something; when the things promised come, the promises are taken away. "A heart contrite and humbled God despises not." You know that God is high: if you shall have made yourself high, He will be from you; if you shall have humbled yourself, He will draw near to you.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:18
See who this is: David as one man was seeming to implore; see ye here our image and the type of the Church.

"Deal kindly, O Lord, in Your good will with Sion" [Psalm 51:18]. With this Sion deal kindly. What is Sion? A city holy. What is a city holy? That which cannot be hidden, being upon a mountain established. Sion in prospect, because it has prospect of something which it hopes for. For Sion is interpreted "prospect," and Jerusalem, "vision of peace." You perceive then yourselves to be in Sion and in Jerusalem, if being sure ye look for hope that is to be, and if you have peace with God. "And be the walls of Jerusalem built." "Deal kindly, O Lord, in Your good will with Sion, and be the walls of Jerusalem built." For not to herself let Sion ascribe her merits: do Thou with her deal kindly, "Be the walls of Jerusalem built:" be the battlements of our immortality laid, in faith and hope and charity.

Source: Exposition on Psalm 51
[AD 430] Augustine of Hippo on Psalms 51:19
"Then You shall accept the sacrifice of righteousness" [Psalm 51:19]. But now sacrifice for iniquity, to wit, a spirit troubled, and a heart humbled; then the sacrifice of righteousness, praises alone. For, "Blessed they that dwell in Your house, for ever and ever they shall praise You:" for this is the sacrifice of righteousness. "Oblations and holocausts." What are "holocausts"? A whole victim by fire consumed. When a whole beast was laid upon the altar with fire to be consumed, it was called a holocaust. May divine fire take us up whole, and that fervour catch us whole. What fervour? "Neither is there that hides himself from the heat thereof." What fervour? That whereof speaks the Apostle: "In spirit fervent." [Romans 12:11] Be not merely our soul taken up by that divine fire of wisdom, but also our body; that it may earn their immortality; so be it lifted up for a holocaust, that death be swallowed into victory. "Oblations and holocausts." "Then shall they lay upon your altar calves." Whence "calves"? What shall He therein choose? Will it be the innocence of the new age, or necks freed from the yoke of the law?...

Source: Exposition on Psalm 51