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1 Make a joyful noise unto God, all ye lands: 2 Sing forth the honour of his name: make his praise glorious. 3 Say unto God, How terrible art thou in thy works! through the greatness of thy power shall thine enemies submit themselves unto thee. 4 All the earth shall worship thee, and shall sing unto thee; they shall sing to thy name. Selah. 5 Come and see the works of God: he is terrible in his doing toward the children of men. 6 He turned the sea into dry land: they went through the flood on foot: there did we rejoice in him. 7 He ruleth by his power for ever; his eyes behold the nations: let not the rebellious exalt themselves. Selah. 8 O bless our God, ye people, and make the voice of his praise to be heard: 9 Which holdeth our soul in life, and suffereth not our feet to be moved. 10 For thou, O God, hast proved us: thou hast tried us, as silver is tried. 11 Thou broughtest us into the net; thou laidst affliction upon our loins. 12 Thou hast caused men to ride over our heads; we went through fire and through water: but thou broughtest us out into a wealthy place. 13 I will go into thy house with burnt offerings: I will pay thee my vows, 14 Which my lips have uttered, and my mouth hath spoken, when I was in trouble. 15 I will offer unto thee burnt sacrifices of fatlings, with the incense of rams; I will offer bullocks with goats. Selah. 16 Come and hear, all ye that fear God, and I will declare what he hath done for my soul. 17 I cried unto him with my mouth, and he was extolled with my tongue. 18 If I regard iniquity in my heart, the Lord will not hear me: 19 But verily God hath heard me; he hath attended to the voice of my prayer. 20 Blessed be God, which hath not turned away my prayer, nor his mercy from me.
[AD 430] Augustine of Hippo on Psalms 66:1
...Thence he begins, "Be joyful in God." Who? "Every land" [Psalm 66:1]. Not therefore Judæa alone. See, brethren, after what sort is set forth the universality of the Church in the whole world spread abroad: and mourn ye not only the Jews, who envied the Gentiles that grace, but still more for heretics wail ye. For if they are to be mourned, that have not been gathered together, how much more they that being gathered together have been divided? "Jubilate in God every land." What is "jubilate"? Into the voice of rejoicings break forth if you cannot into that of words. For "jubilation" is not of words, but the sound alone of men rejoicing is uttered, as of a heart labouring and bringing forth into voice the pleasure of a thing imagined which cannot be expressed. "Be joyful in God every land:" let no one jubilate in a part: let every land be joyful, let the Catholic Church jubilate. The Catholic Church embraces the whole: whosoever holds a part and from the whole is cut off, should howl, not jubilate.

[AD 430] Augustine of Hippo on Psalms 66:2
"But play ye to His name" [Psalm 66:2]. What has he said? By you "playing" let His name be blessed. But what it is to "play"? To play is also to take up an instrument which is called a psaltery, and by the striking and action of the hands to accompany voices. If therefore ye jubilate so that God may hear; play also something that men may both see and hear: but not to your own name....For if for the sake of yourselves being glorified ye do good works, we make the same reply as He made to certain of such men, "Verily I say unto you, they have received their reward:" [Matthew 6:2] and again, "Otherwise no reward ye will have with your Father that is in Heaven." [Matthew 6:1] You will say, ought I, then, to hide my works, that I do them not before men? No. But what says He? "Let your works shine before men." In doubt then I shall remain. On one side You say to me, "Take heed that you do not your righteousness before men:" on the other side You say to me, "Let your good works shine before men;" what shall I keep? What do? What leave undone? A man can as well serve two masters commanding different things as one commanding different things. I command not, says the Lord, different things. The end observe, for the end sing: with what end you do it, see thou. If for this reason you do it, that you may be glorified, I have forbidden it: but if for this reason, that God may be glorified, I have commanded it. Play therefore, not to your own name, but to the name of the Lord your God. Play ye, let Him be lauded: live ye well, let Him be glorified. For whence have ye that same living well? If for everlasting ye had had it, you would never have lived ill; if from yourselves ye had had it, you never would have done otherwise than have lived well. "Give glory to His praise." Our whole attention upon the praise of God he directs, nothing for us he leaves whence we should be praised. Let us glory thence the more, and rejoice: to Him let us cleave, in Him let us be praised. You heard when the Apostle was being read, "See ye your calling, brethren, how not many wise after the flesh, not many mighty, not many noble, but the foolish things of the world God has chosen to confound the wise." [1 Corinthians 1:26-27] ...But the Lord chose afterwards orators also; but they would have been proud, if He had not first chosen fishermen; He chose rich men; but they would have said that on account of their riches they had been chosen, unless at first He had chosen poor men: He chose Emperors afterwards; but better is it, that when an Emperor has come to Rome, he should lay aside his crown, and weep at the monument of a fisherman, than that a fisherman should weep at the monument of an Emperor. "For the weak things of the world God has chosen to confound the strong," etc. [1 Corinthians 1:27] ...And what follows? The Apostle has concluded, "That there might not glory before God any flesh." See ye how from us He has taken away, that He might give glory: has taken away ours, that He might give His own; has taken away empty, that He might give full; has taken away insecure, that He might give solid....

[AD 430] Augustine of Hippo on Psalms 66:3
"Say ye to God, How to be feared are Your works!" [Psalm 66:3]. Wherefore to be feared and not to be loved? Hear another voice of a Psalm: "Serve the Lord in fear, and exult unto Him with trembling." What means this? Hear the voice of the Apostle: "With fear," he says, "and trembling, work out your own salvation." [Philippians 2:12] Wherefore with fear and trembling? He has subjoined the reason: "for God it is that works in you both to will and to work according to good will." [Philippians 2:13] If therefore God works in you, by the Grace of God you work well, not by your strength. Therefore if you rejoice, fear also: lest perchance that which was given to a humble man be taken away from a proud one....Brethren, if against the Jews of old, cut off from the root of the Patriarchs, we ought not to exalt ourselves, but rather to fear and say to God, "How to be feared are Your works:" how much less ought we not to exalt ourselves against the fresh wounds of the cutting off! Before there had been cut off Jews, graffed in Gentiles; from the very graft there have been cut off heretics; but neither against them ought we to exalt ourselves; lest perchance he deserve to be cut off, that delights to revile them that are cut off. My brethren, a bishop's voice, however unworthy, has sounded to you: we pray you to beware, whosoever you are in the Church, do not revile them that are not within; but pray ye rather, that they too may be within. For God is able again to graft them in. [Romans 11:23] Of the very Jews the Apostle said this, and it was done in their case. The Lord rose again, and many believed: they perceived not when they crucified, nevertheless afterwards they believed in Him, and there was forgiven them so great a transgression. The shedding of the Lord's blood was forgiven the manslayers, not to say, God-slayers: "for if they had known, the Lord of glory they never would have crucified." [1 Corinthians 2:8] Now to the manslayers has been forgiven the shedding of the blood of Him innocent: and that same blood which through madness they shed, through grace they have drunk....O fullness of Gentiles, say thou to God, "How to be feared are Your works!" and so rejoice thou as that you may fear, be not exalted above the branches cut off.

[AD 430] Augustine of Hippo on Psalms 66:4-6
Also in this place (which we have been quoting), the apostle to the Gentiles said that the wrath of God comes on the children of infidelity because of these evils. When, however, he says, “And you yourselves once walked in them when they were your life,” he shows well enough that they were not their life then. To them, indeed, they were dead, since their life was hidden with Christ in God. For the evils, in truth, were living in those who were not living in the evils, as I indicated a little while ago. Likewise, the vices, indeed, that were dwelling in the members of certain people were said to be their members, by a figure of speech in which the name of a place is given to the things contained within it, just as it is said that the whole forum speaks when what is meant is that the people who are in the forum are speaking. By this same figure of speech, there is sung in the psalm, “Let all the earth adore you,” that is, all people who are on the earth.

[AD 430] Augustine of Hippo on Psalms 66:4-5
Let Jews remain in their lies: to You, because in the multitude of Your power they lied, let there be done that which follows, "Let every land worship You, and play to You, play to Your name, O Most Highest" [Psalm 66:4]. A little before, Most Lowly, now Most Highest: Most Lowly in the hands of lying enemies; Most Highest above the head of praising Angels. O you Gentiles, O most distant nations, leave lying Jews, come confessing. "Come ye, and see the works of the Lord: terrible in counsels above the sons of men" [Psalm 66:5]. Son of Man indeed He too has been called, and verily Son of Man He became: very Son of God in the form of God; [Philippians 2:6] very Son of Man in form of a servant: but do not judge of that form by the condition of others alike: "terrible" He is "in counsels above the sons of men." Sons of men took counsel to crucify Christ, being crucified He blinded the crucifiers. What then have ye done, sons of men, by taking keen counsels against your Lord, in whom was hidden Majesty, and to sight shown weakness? You were taking counsels to destroy, He to blind and save; to blind proud men, to save humble men: but to blind those same proud men, to the end that, being blinded they might be humbled, being humbled might confess, having confessed might be enlightened. "Terrible in counsels above the sons of men." Terrible indeed. Behold blindness in part to Israel has happened: [Romans 11:25] behold the Jews, out of whom was born Christ, are without: behold the Gentiles, that were against Judæa, in Christ are within. "Terrible in counsels above the sons of men."

[AD 458] Theodoret of Cyrus on Psalms 66:4-6
Then [Symmachus] outlines what was done of old. “He turns the sea into dry land; they will cross the river on foot.” The tense has been changed here: he spoke of the past as future, whereas the others retained the tense, Symmachus saying, “He turned the sea into dry land, they crossed the river on foot.” This is the God, he is saying, who will grant us salvation as well, who of old divided sea and river, and bade our forebears cross without risk and accords the nations the crossing that they make when through the washing of regeneration they are reformed. In other words, just as at that time through the hand of the mighty Moses he divided the Red Sea at this point, … so now as well through the hand of the priests he renews the people who believe in Christ, while submerging in figure Pharaoh with his chariots—that is, the devil with his desires (the initiated know what I mean).

[AD 430] Augustine of Hippo on Psalms 66:6
Wherefore what has He done by the terror of His counsel? He has turned the sea into dry land. For this follows, "That has turned the sea into dry land" [Psalm 66:6]. A sea was the world, bitter with saltness, troubled with tempest, raging with waves of persecutions, sea it was: truly into dry land the sea has been turned, now there thirsts for sweet water the world that with salt water was filled. Who has done this? He "that has turned the sea into dry land." Now the soul of all the Gentiles says what? "My soul is as it were land without water to You." "That has turned the sea into dry land. In the river they shall pass over on foot." Those same persons that have been turned into dry land, though they were before sea, "in the river on foot shall pass over." What is the river? The river is all the mortality of the world. Observe a river: some things come and pass by, other things that are to pass by do succeed. Is it not thus with the water of a river, that from earth springs and flows? Every one that is born must needs give place to one going to be born: and all this order of things rolling along is a kind of river. Into this river let not the soul greedily throw herself, let her not throw herself, but let her stand still. And how shall she pass over the pleasures of things doomed to perish? Let her believe in Christ, and she will pass over on foot: she passes over with Him for Leader, on foot she passes over.

[AD 430] Augustine of Hippo on Psalms 66:7
In whom? "In Him that reigns in His virtue for everlasting" [Psalm 66:7]. For what virtue have we and is it everlasting? If everlasting were our virtue, we should not have slipped, should not have fallen into sin, we should not have deserved penal mortality. He, of His good pleasure, took up that whereunto our desert threw us down. "That reigns in His virtue for everlasting." Of Him partakers let us be made, in whose virtue we shall be strong, but He in His own. We enlightened, He a light enlightening: we, being turned away from Him, are in darkness; turned away from Himself He cannot be. With the heat of Him we are warmed; from whence withdrawing we had grown cold, to the Same drawing near again we are warmed. Therefore let us speak to Him that He may keep us in His virtue, because "in Him we will be joyous that reigns in His virtue for everlasting."

[AD 430] Augustine of Hippo on Psalms 66:8-9
"Bless our God, you nations" [Psalm 66:8]. Behold, there have been driven back they that are bitter, reckoning has been made with them: some have been converted, some have continued proud. Let not them terrify you that grudge the Gentiles Gospel Grace: now has come the Seed of Abraham, in whom are blessed all nations. [Genesis 12:3] Bless ye Him in whom you are blessed, "Bless our God, you nations: and hear ye the voice of His praise." Praise not yourselves, but praise Him. What is the voice of His praise? That by His Grace we are whatever of good we are. "Who has set my Soul unto life" [Psalm 66:9] Behold the voice of his praise: "Who has set my Soul unto life." Therefore in death she was: in death she was, in yourself. Thence it is that you ought not to have been exalted in yourselves. Therefore in death she was, in yourself: where will it be in life, save in Him that said, "I am the Way, the Truth, and the Life"? [John 14:6] Just as to certain believers the Apostle says, "You were sometime darkness, but now light in the Lord." [Ephesians 5:8] ..."And has not given unto motion my feet." He has set my Soul unto life, He guides the feet that they stumble not, be not moved and given unto motion; He makes us to live, He makes us to persevere even unto the end, in order that for everlasting we may live....

[AD 373] Athanasius of Alexandria on Psalms 66:10-12
And although the entrance is “straight and narrow,” once inside we see a vast and limitless space, greater than any other anywhere. We have been told of these things by eyewitnesses and heirs. They speak of their trials and distresses: “You have placed afflictions before us,” but then they add, “You brought us out into a spacious place”—and, “You gave us space in our distress.”

[AD 386] Cyril of Jerusalem on Psalms 66:10-12
“And lead us not into temptation, O Lord.” Is it this then what the Lord teaches us to pray, that we may not to be tempted at all? How, then, is it said elsewhere, “an untempted person is a person unproved”; and again, “My brothers, count it all joy when you fall into various temptations”? But does perchance the entering into temptation mean being overwhelmed by the temptation? For temptation is like a winter torrent difficult to cross. Those, therefore, who are not overwhelmed in temptations, pass through, showing themselves excellent swimmers and not being swept away by them at all; while those who are not such, enter into them and are overwhelmed. As for example, Judas having entered into the temptation of the love of money, did not swim through it but was overwhelmed and was strangled both in body and spirit. Peter entered into the temptation of the denial; but having entered, he was not overwhelmed by it but courageously swam through it and was delivered from the temptation. Listen again, in another place, to a company of unscathed saints, giving thanks for deliverance from temptation: “You, O God, have proved us; you have tried us by fire like silver is tried. You brought us into the net; you laid afflictions on our loins. You have caused people to ride over our heads; we went through fire and water; and you brought us out into a place of rest.” You see them speaking boldly in regard to their having passed through and not been pierced. “But you brought us out into a place of rest”; now their coming into a place of rest is their being delivered from temptation.

[AD 430] Augustine of Hippo on Psalms 66:10-11
"For you have proved us, O God; You have fired us as silver is fired" [Psalm 66:10]. Have not fired us like hay, but like silver: by applying to us fire, You have not turned us into ashes, but You have washed off uncleanness, "You have fired us, as silver is fired." And see in what manner God is angry against them, whose Soul He has set unto life. "You have led us into a trap:" not that we might be caught and die, but that we might be tried and delivered from it. "You have laid tribulations upon our back." For having been to ill purpose lifted up, proud we were: having been to ill purpose lifted up, we were bowed down, in order that being bowed down, we should be lifted up for good. "You have laid tribulations on our back:" "You have set men over our heads" [Psalm 66:11]. All these things the Church has suffered in sundry and various persecutions: She has suffered this in Her individual members, even now does suffer it. For there is not one, that in this life could say that he was exempt from these trials. Therefore there are set even men over our heads: we endure those whom we would not, we suffer for our betters those whom we know to be worse. But if sins be wanting, a man is justly superior: but by how much there are more sins, by so much he is inferior. And it is a good thing to consider ourselves to be sinners, and thus endure men set over our heads: in order that we also to God may confess that deservedly we suffer. For why do you suffer with indignation that which He does who is just? "You have laid tribulations upon our back: You have set men over our heads." God seems to be angry, when He does these things: fear not, for a Father He is, He is never so angry as to destroy. When ill you live, if He spares, He is more angry. In a word, these tribulations are the rods of Him correcting, lest there be a sentence from Him punishing....

[AD 379] Basil of Caesarea on Psalms 66:13-14
If you require evidence from the Old Testament also in order for me to convince you that the judgment of God occurs in this way [as I have presented it], Moses says, “You shall love the Lord your God with all your heart and with all your mind and with all your strength,” and “You shall love your neighbor as yourself.” To this the Lord adds, “On these two commandments depend the whole law and the prophets.” The apostle also bears witness in the words: “Love, therefore, is the fulfilling of the law.” Moreover, they who do not observe these commands and do not perform the acts of justification that derive from them are liable to punishment, as Moses declares in the words “Cursed is every one who does not abide in all that is written in this book.” And David says, “If I have contemplated iniquity in my heart, the Lord will not hear me.” In another place, also, he says, “There have they trembled for fear where there was no fear; for God has scattered the bones of those who attacked you.” There is need, then, of great diligence and of ceaseless care, lest, perhaps, in carrying out the commandment improperly as regards any of the details we have discussed, we may not only lose a reward so great and so blessed but also become the objects of threats so terrible.

[AD 430] Augustine of Hippo on Psalms 66:13
Observe how not only concerning a cool place, but neither of that very fire to be desired he has been silent: "I will enter into Your House in holocausts" [Psalm 66:13]. What is a holocaust? A whole sacrifice burned up, but with fire divine. For a sacrifice is called a holocaust, when the whole is burned. One thing are the parts of sacrifices, another thing a holocaust: when the whole is burned and the whole consumed by fire divine, it is called a holocaust: when a part, a sacrifice. Every holocaust indeed is a sacrifice: but not every sacrifice a holocaust. Holocausts therefore he is promising, the Body of Christ is speaking, the Unity of Christ is speaking, "I will enter into Your House in holocausts." All that is mine let Your fire consume, let nothing of mine remain to me, let all be Yours. But this shall be in the Resurrection of just men, "when both this corruptible shall be clad in incorruption, and this mortal shall be clad in immortality: then shall come to pass that which has been written, 'Death is swallowed up in victory.'" [1 Corinthians 15:54] Victory is, as it were, fire divine: when it swallows up our death also, it is a holocaust. There remains not anything mortal in the flesh, there remains not anything culpable in the spirit: the whole of mortal life shall be consumed, in order that in life everlasting it may be consummated, that from death we may be preserved in life. These therefore will be the holocausts. And what shall there be "in the holocausts"?

[AD 533] Fulgentius of Ruspe on Psalms 66:13-14
Therefore, because we have been speaking of the nature of marriage as the Lord has given it, consequently, this must be examined with the greatest care, namely, what you devoutly willed beforehand (if there could have been anything). Because the use of things conceded by God is not forbidden to human beings, one should not conclude that therefore one need not render to God what he has vowed. It is written: “I will pay you my vows, those that my lips uttered.” And lest anyone seek to use tribulation as a reason for excusing himself, in order to gain the freedom to evade a promise or to think of himself as free from what he has vowed, by saying that he was forced to vow something not by his own will but because of tribulation, the blessed David teaches that everything that was legitimately promised, even in tribulation, must be given back to God, when he says to God, “I will pay you my vows, those that my lips uttered.” And he added immediately, “my mouth promised when I was in trouble.” But in Deuteronomy, it is also written, “If you make a vow to the Lord your God, do not postpone fulfilling it; for the Lord your God will surely require it of you, and you would incur guilt. But if you refrain from vowing, you will not incur guilt. Whatever your lips utter, you must diligently perform, just as you have freely vowed to the Lord your God with your own mouth.” And Solomon says, “When you make a vow to God, do not delay fulfilling it; … Fulfill what you vow. It is better that you should not vow than that you should vow and not fulfill it.”

[AD 430] Augustine of Hippo on Psalms 66:14
"I will render to You my vows, which my lips have distinguished" [Psalm 66:14]. What is the distinction in vows? This is the distinction, that yourself thou censure, Him thou praise: perceive yourself to be a creature, Him the Creator: yourself darkness, Him the Enlightener, to whom you should say, "You shall light my lamp, O Lord my God, You shall enlighten my darkness." For whenever you shall have said, O soul, that from yourself you have light, you will not distinguish. If you will not distinguish, you will not render distinct vows. Render distinct vows, confess yourself changeable, Him unchangeable: confess yourself without Him to be nothing, but Himself without you to be perfect; yourself to need Him, but Him not to need you. Cry to Him, "I have said to the Lord, My God are You, for my good things You need not." Now though God takes you to Him for a holocaust, He grows not, He is not increased, He is not richer, He becomes not better furnished: whatsoever He makes of you for your sake, is the better for you, not for Him that makes. If you distinguish these things, you render the vows to your God which your lips have distinguished.

[AD 430] Augustine of Hippo on Psalms 66:15
"And my mouth has spoken in my tribulation." How sweet ofttimes is tribulation, how necessary! In that case what has the mouth of the same spoken in his tribulation? "Holocausts marrowed I will offer to You" [Psalm 66:15]. What is "marrowed"? Within may I keep Your love, it shall not be on the surface, in my marrow it shall be that I love You. For there is nothing more inward than our marrow: the bones are more inward than the flesh, the marrow is more inward than those same bones. Whosoever therefore on the surface loves God, desires rather to please men, but having some other affection within, he offers not holocausts of marrow: but into whosesoever marrow He looks, him He receives whole. "With incense and rams." The rams are the rulers of the Church: the whole Body of Christ is speaking: this is the thing which he offers to God. Incense is what? Prayer. "With incense and rams." For especially the rams do pray for the flocks. "I will offer to You oxen with he-goats." Oxen we find treading out grain, and the same are offered to God. The Apostle has said, that of the preachers of the Gospel must be understood that which has been written, "Of the ox treading out grain the mouth you shall not muzzle. Does God care for oxen?" Therefore great are those rams, great the oxen. What of the rest, that perchance are conscious of certain sins, that perchance in the very road have slipped, and, having been wounded, by penitence are being healed? Shall they too continue, and to the holocausts shall they not belong? Let them not fear, he has added he-goats also. "I will offer to You oxen with he-goats." By the very yoking are saved the he-goats; of themselves they have no strength, being yoked to bulls they are accepted. For they have made friends of the mammon of iniquity, that the same may receive them into everlasting tabernacles. [Luke 16:9] Therefore those he-goats shall not be on the left, because they have made to themselves friends of the mammon of iniquity. But what he-goats shall be on the left? They to whom shall be said, "I hungred, and you gave me not to eat:" [Matthew 25:42] not they that have redeemed their sins by almsdeeds.

[AD 430] Augustine of Hippo on Psalms 66:16-17
Come ye, hear, and I will tell, all you that fear God [Psalm 66:16]. Let us come, let us hear, what he is going to tell, "Come ye, hear, and I will tell." But to whom, "Come ye, and hear"? "All you that fear God." If God ye fear not, I will not tell. It is not possible that it be told to any where the fear of God is not. Let the fear of God open the ears, that there may be something to enter in, and a way whereby may enter in that which I am going to tell. But what is he going to tell? "How great things He has done to my soul." Behold, he would tell: but what is he going to tell? Is it perchance how widely the earth is spread, how much the sky is extended, and how many are the stars, and what are the changes of sun and of moon? This creation fulfills its course: but they have very curiously sought it out, the Creator thereof have not known. [Wisdom 13:1] This thing hear, this thing receive, "O you that fear God, how great things He has done to my soul:" if you will, to yours also. "How great things He has done to my soul." "To Him with my mouth I have cried" [Psalm 66:17]. And this very thing, he says, has been done to his soul; that to Him with his mouth he should cry, has been done, he says, to his soul. Behold, brethren, Gentiles we were, even if not in ourselves, in our parents. And what says the Apostle? "You know, when Gentiles you were, to idols without speech how ye went up, being led." [1 Corinthians 12:2] Let the Church now say, "how great things He has done to my soul." "To Him with my mouth I have cried." I a man to a stone was crying, to a deaf stock I was crying, to idols deaf and dumb I was speaking: now the image of God has been turned to the Creator thereof. I that was "saying to a stock, My father you are; and to a stone, You have begotten me:" [Jeremiah 2:27] now say, "Our Father, which art in Heaven." [Matthew 6:9] ..."To Him with my mouth I have cried, and I have exalted Him under my tongue." See how in secret He would be uncorrupt that offers marrowed holocausts. This do ye, brethren, this imitate, so that you may say, "Come ye, see how great things He has done to my soul." For all those things of which he tells, by His Grace are done in our soul. See the other things of which he speaks.

[AD 430] Augustine of Hippo on Psalms 66:18
"If I have beheld iniquity in my heart, may not the Lord hearken" [Psalm 66:18]. Consider now, brethren, how easily, how daily men blushing for fear of men do censure iniquities; He has done ill, He has done basely, a villain the fellow is: this perchance for man's sake he says. See whether you behold no iniquity in your heart, whether perchance that which you censure in another, you are meditating to do, and therefore against him dost exclaim, not because he has done it, but because he has been found out. Return to yourself, within be to yourself a judge. Behold in your hid chamber, in the very inmost recess of the heart, where thou and He that sees are alone, there let iniquity be displeasing to you, in order that you may be pleasing to God. Do not regard it, that is, do not love it, but rather despise it, that is, contemn it, and turn away from it. Whatever pleasing thing it has promised to allure you to sin; whatever grievous thing it has threatened, to drive you on to evil doing; all is nought, all passes away: it is worthy to be despised, in order that it may be trampled upon; not to be eyed lest it be accepted.. ..

[AD 430] Augustine of Hippo on Psalms 66:19-20
"Therefore God has hearkened to me" [Psalm 66:19]. Because I have not beheld iniquity in my heart. "And He has listened to the voice of my prayer." "Blessed be my God, that has not thrust away my supplication and His mercy from me" [Psalm 66:20]. Gather the sense from that place, where he says, "Come ye, hear, and I will tell you, all you that fear God, how great things He has done to my soul:" he has both said the words which you have heard, and at the end thus he has concluded: "Blessed be my God, that has not thrust away my supplication and His mercy from me." For thus there arrives at the Resurrection he that speaks, where already we also are by hope: yea both it is we ourselves, and this voice is ours. So long therefore as here we are, this let us ask of God, that He thrust not from us our supplication, and His mercy, that is, that we pray continually, and He continually pity. For many become feeble in praying, and in the newness of their own conversion pray fervently, afterwards feebly, afterwards coldly, afterwards negligently: as if they have become secure. The foe watches: you sleep. The Lord Himself has given commandment in the Gospel, how "it behooves men always to pray and not to faint." And he gives a comparison from that unjust judge, who neither feared God, nor regarded man, whom that widow daily importuned to hear her; and he yielded for weariness, that was not influenced by pity: and the naughty judge says to himself, "Though neither God I fear, nor men I regard, even because of the weariness which this widow daily puts upon me, I will hear her cause, and will avenge her." And the Lord says, "If a naughty judge has done this, shall not your Father avenge His chosen, that to Him do cry day and night? Yea, I say unto you, He shall make judgment of them speedily." Therefore let us not faint in prayer. Though He puts off what He is going to grant, He puts it not away: being secure of His promise, let us not faint in praying, and this is by His goodness. Therefore he has said, "Blessed is my God, that has not thrust away my supplication and His mercy from me." When you have seen your supplication "not thrust away from you," be secure, that His mercy has not been thrust away from you.