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1 And the word of the LORD came unto Jonah the second time, saying, 2 Arise, go unto Nineveh, that great city, and preach unto it the preaching that I bid thee. 3 So Jonah arose, and went unto Nineveh, according to the word of the LORD. Now Nineveh was an exceeding great city of three days' journey. 4 And Jonah began to enter into the city a day's journey, and he cried, and said, Yet forty days, and Nineveh shall be overthrown. 5 So the people of Nineveh believed God, and proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them. 6 For word came unto the king of Nineveh, and he arose from his throne, and he laid his robe from him, and covered him with sackcloth, and sat in ashes. 7 And he caused it to be proclaimed and published through Nineveh by the decree of the king and his nobles, saying, Let neither man nor beast, herd nor flock, taste any thing: let them not feed, nor drink water: 8 But let man and beast be covered with sackcloth, and cry mightily unto God: yea, let them turn every one from his evil way, and from the violence that is in their hands. 9 Who can tell if God will turn and repent, and turn away from his fierce anger, that we perish not? 10 And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not.
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[AD 420] Jerome on Jonah 3:1-2
"And the word of the LORD came unto Jonah the second time, saying, arise, go unto Nineveh, that great city, and preach unto it the preaching that I bid you." LXX: 'and the message of God came to Jonah a second time, saying, arise, go to Nineveh, the great city, and preach there this message that I have told you'. He did not say to the prophet, "why have you not done what you were ordered to do?." But the punishment of the shipwreck and his drowning are enough for him to understand the Lord, the liberator, whom he hadn't known to be ordering. Moreover it is superfluous to see his wounds as those of a false servant of God, once he has been smitten, for such a punishment is less of a correction than a reproof. And our Lord is sent to Nineveh a second time after his resurrection: he who had fled by whatever means beforehand when he said, "My Father, if it is possible let this cup pass me by" [Mt. 26:39], and who had not wanted to give bread of children to dogs, now the children have cried out, "crucify him, crucify him! we have no king except Caesar" [Lk. 23:21; John 19:15], he makes his way towards Nineveh of his own accord to preach after his resurrection that he underwent as he was ordered to do before his suffering. The command is given, he hears it, he refuses, then he is forced to want, and the second time he carries out the will of the Father: all of this is connected to man and to the "form of a slave" [Phil. 2:7], to whom such expressions are appropriate.

Source: Commentary on Jonah, Chapter 3
[AD 865] Haimo of Auxerre on Jonah 3:1
This is not uttered with reproach, nor is he asked, "Why did you not do what I commanded?" Indeed the hard correction of being shipwrecked and being swallowed was sufficient.
[AD 865] Haimo of Auxerre on Jonah 3:2
Jonah arose, it says; he did not delay, but immediately made himself ready for obeying.
[AD 420] Jerome on Jonah 3:3
"So Jonah arose, and went unto Nineveh, according to the word of the LORD. Now Nineveh was an exceeding great city of three days' journey. [And Jonah began to enter into the city a day's journey]" LXX: 'so Jonah arose and went to Nineveh, according to the word of the Lord. Now Nineveh was a city of godly size, around three days in journey. Jonah began to enter the city, about one day's travel.' Jonah immediately carries out the command that he has been given. Nineveh to which the prophet was journeying, was a great city, which it took around three days' journey to circle. But he remembers the command he has been given and the recent shipwreck and makes the normal journey of three days in one day. However, there are some people who believe that he simply proclaimed his message in a third of the city, and that his speech quickly was made known to the other inhabitants. And our Lord is said to arise and speak of his own accord after being in hell, and announces the word of the Lord when he sends the apostles to baptise those who were in Nineveh in the name of the Father the Son and the Holy Spirit [Mt. 28:19]. So there are the three days of journey! And this sacrament of mankind's safety is "a journey of one day", that is it is finished by the proclamation of one sole God. Jonah preaches not so much to the apostles but more by the method of the apostles. He himself says, "and I will be with you always until the end of the world" [Mt. 28:20]. There is no doubt that Nineveh was a city of godly magnitude because the world and all things have existed through God and because without Him nothing would ever have existed. [John 1:3] Note too that he has not said, "of three days and three nights" or "of one day and of one night", but simply "and of three days", and "of one day", to show that in the sacrament of the Trinity and of the confession of one sole God there is no darkness.

Source: Commentary on Jonah, Chapter 3
[AD 430] Augustine of Hippo on Jonah 3:3
Why, then, are we asked what was prefigured by the prophet being swallowed by that monster and restored alive on the third day? Christ explained it when he said an evil and adulterous generation seeks a sign, and a sign shall not be given to it, but the sign of Jonah the prophet. For as Jonah was in the whale’s belly three days and three nights, so shall the Son of man be in the heart of the earth three days and three nights. … So then, as Jonah went from the ship into the belly of the whale, so Christ went from the tree into the tomb, or into the abyss of death. And as Jonah was sacrificed for those endangered by the storm, so Christ was offered for those who are drowning in the storm of this world. And as Jonah was first commanded to preach to the Ninevites but his prophecy did not come to them until after the whale had vomited him out, so the prophecy made to the Gentiles did not come to them until after the resurrection of Christ.

Source: LETTER 102:6
[AD 99] Clement of Rome on Jonah 3:4-5
Let us turn to every age that has passed, and learn that, from generation to generation, the Lord has granted a place of repentance to all such as would be converted unto Him... Jonah proclaimed destruction to the Ninevites; but they, repenting of their sins, propitiated God by prayer, and obtained salvation, although they were aliens [to the covenant] of God.

Source: Clement's First Letter to the Corinthians, Chapter 7
[AD 253] Origen of Alexandria on Jonah 3:4
Does God for our salvation deceive and say certain things so that the sinner ceases doing what he might do if he had not heard certain of these words? Was the one who says, “Yet three days and Nineveh shall be destroyed,” speaking as one who speaks truly or not? Or as one who deceives by a deceit that converts? If that kind of conversion did not happen, was what was said no longer a deceit but already truth. There would have been a destruction that followed for Nineveh. It was up to those who hear.

Source: HOMILIES ON JEREMIAH 19:7
[AD 407] John Chrysostom on Jonah 3:4
God threatens to destroy the city of Nineveh for the very reason that He might not destroy it. When God makes a threat concerning our sins, He makes the threat beforehand so that we may be sobered by fear, so that our repentance will bring about God’s mercy so He will not have to follow through with the threat. (Hom. On Paralytic 3)
[AD 407] John Chrysostom on Jonah 3:4
If you want, let us also hear this story: “Now the word of the Lord,” it says, “came to Jonah, saying, ‘Rise and go to Nineveh, the great city.’ ” He wanted to put Jonah to shame by sending him to the great city of Nineveh, because he foresaw the prophet’s escape. However, let us also listen to the preaching: “Yet three days, and Nineveh shall be overthrown.” Why do you, God, foretell the sufferings that you will inflict upon Nineveh? “So that I will not do what I announced.” This is why God threatened with hell—so he would not lead anyone away to hell. He says, “Fear that which is spoken to you, and do not be saddened about what has been done.” Why does he establish the appointed time to be only a period of three days? So that you may learn even the virtue of the barbarians—I call the Ninevites barbarians, who were able to annul in three days such anger caused by sin. I want you to marvel at the philanthropy of God, who was satisfied with three days of repentance for so many transgressions. I do not want you to sink into despair, even though you have innumerable sins.

Source: HOMILIES ON REPENTANCE AND ALMSGIVING 5:4
[AD 420] Jerome on Jonah 3:4
"[And Jonah began to enter into the city a day's journey], and he cried, and said, Yet forty days, and Nineveh shall be overthrown." LXX: 'he proclaimed and said, another three days and Nineveh will be destroyed". The umber three written in the Septuagint does not agree with the penitence, and I am quite astonished at this translation, for in Hebrew neither the letters or syllables or accents or the word show any common element. For three is said, salos and forty arbaim. Moreover the prophet who was sent from Judea to the Assyrians was to claim after such a journey penitence worthy of his prediction to cure with a long-present dressing his old and putrid wounds. Moreover the number forty is appropriate to sinners, to hunger, to prayer, to sackcloth, to tears and to perseverance in prayer. In this way Moses fasted for forty days on mount Sinai [Ex. 34:28; Deut. 9:18] and Elijah fleeing Jezebel [3 Kings. 19:8] is presented to us as having fasted for forty days after having told Israel about the famine [3 Kings. 17:1], when the anger of God was upon them. And the Lord Himself, the true Jonah who is sent to preach to the world fasts for forty days [Mt. 4:2]. And he leaves us as hereditary fasting to prepare our spirits, by this number of forty, as the food of his body. "he cried out": the Gospel shows this expression more fully: "standing, he cried out in the temple: if anyone is thirsty, let him come to me and he shall drink" [John 7:37], for all speech of the Saviour is called a cry because he speaks about weighty subjects.

Source: Commentary on Jonah, Chapter 3
[AD 420] Jerome on Jonah 3:4
[Daniel 4:27] "'Wherefore, O king, let my counsel meet with thy favor, and make up for thy sins by deeds of charity, and thine iniquities by showing mercy to the poor. Perhaps God will forgive thy transgressions.'" Since he had previously pronounced the sentence of God, which of course cannot be altered, how could he exhort the king to deeds of charity and acts of mercy towards the poor? This difficulty is easily solved by reference to the example of King Hezekiah, who Isaiah had said was going to die (Isaiah 38:1); and again, to the example of the Ninevites, to whom it was said: "Yet forty days, and Nineveh shall be destroyed" (Jonah 3:4). And yet the sentence of God was changed in response to the prayers of Hezekiah and the city of Nineveh, not by any means because of the ineffectualness of the judgment itself but because of the conversion of those who merited pardon. Morever in Jeremiah God states that He threatens evil for the nation (Jeremiah 18:7-8), but if it does that which is good, He will alter His threats to bestow mercy. Again, He affirms that He directs His promises to the man who does good; and if the same man thereafter works evil, He says that He changes His decision, not with regard to the men themselves, but with regard to their works which have thus changed in character. For after all, God is not angered at men but at their sins; and when no sins inhere in a man, God by no means inflicts a punishment which has been commuted. In other words, let us say that Nebuchadnezzar performed deeds of mercy toward the poor in accordance with Daniel's advice, and for that reason the sentence against him was delayed of execution for twelve months. But because he afterwards while walking about in his palace at Babylon said boastingly: "Is this not the great Babylon which I myself have built up as a home for the king by the might of my power and the glory of my name?" therefore he lost the virtue of his charitableness by reason of the wickedness of his pride.

"It may be that God will forgive thy sins." In view of the fact that the blessed Daniel, foreknowing the future as he did, had doubts concerning God's decision, it is very rash on the part of those who boldly promise pardon to sinners. And yet it should be recognized that indulgence was promised to Nebuchadnezzar in return, as long as he wrought good works. Much more, then, is it promised to other men who have committed less grievous sins than he. We read in Jeremiah also of God's direction to the people of the Jews, that they should pray for the Babylonians, inasmuch as the peace of the captives was bound up with the peace of the captors themselves (Jeremiah 29:7).

Source: St. Jerome, Commentary on Daniel, CHAPTER FOUR
[AD 542] Caesarius of Arles on Jonah 3:4
We should not despair of those who are still unwilling to correct their vices and do not even blush to defend them. In a similar way hope was not abandoned for that city of which it is written, “Three days more, and Nineveh shall be destroyed”; yet in those three days it was able to be converted, pray, bewail and merit mercy from the threatened punishment. Therefore let all who are such listen to God while it is possible to hear him in his silence; that is, not punishing at present. For he will come and will not be silent, and he will then reprove when there is no chance of amendment.

Source: SERMON 133:3
[AD 390] Gregory of Nazianzus on Jonah 3:5
Let us sow in tears, so that we may reap in joy. Let us show ourselves people of Nineveh, not of Sodom. Let us amend our wickedness, lest we be consumed with it. Let us listen to the preaching of Jonah, lest we be overwhelmed by fire and brimstone. And if we have departed from Sodom, let us escape to the mountain. Let us flee to Zoar. Let us enter it as the sun rises. Let us not stay in all the plain. Let us not look around us, lest we be frozen into a pillar of salt, a really immoral pillar, to accuse the soul that returns to wickedness.

Source: On His Father’s Silence, ORATION 16:14
[AD 397] Ambrose of Milan on Jonah 3:5
If the apostle said too little [about fasting], let them hear the prophet [in the psalm] saying, “I afflicted my soul with fasting.” One who does not fast is uncovered and naked and exposed to wounds. Finally, if Adam had uncovered himself with fasting, he would not have become naked. Nineveh freed itself from death by fasting. The Lord himself said, “But this kind of demon will be cast out only by prayer and fasting.”

Source: LETTER 44
[AD 407] John Chrysostom on Jonah 3:5
Do you see how vexed God is when fasting is treated despitefully? Learn how delighted he is when fasting is honored. When Eve was maltreated, he inflicted death as a penalty upon the insolent individual. He revoked death when she was honored once again. Desiring to show you the power of this thing of importance, he gave her authority over the sentence, after the arrest, to snatch the prisoners from the middle of the journey and change their course toward life. And he did this not only for two or three or twenty people but also for a whole population, in the case of the great and marvelous city of the Ninevites, which had knelt and bowed its head over this pit of perdition and was expecting to suffer the blow from above. Like a heavenly power overseeing Nineveh’s charge, fasting snatched the city from these gates of death and returned Nineveh to life.

Source: HOMILIES ON REPENTANCE AND ALMSGIVING 5:4
[AD 420] Jerome on Jonah 3:5
"So the people of Nineveh believed God, and proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them." LXX: similar. Nineveh believed but Israel did not believe; the foreskin believed, but circumcision remained without faith. First of all the men of Nineveh believed who had arrived at the age of Christ [Eph. 4:13]: they announced a fast and dressed in sackcloth, from the greatest to the smallest of them. This regime and clothing is very worthy of penitence, so that those who had offended God through their indulgence or lust appeased him by condemning all that they had previously offended with. Sackcloth and fasting are the weapons of penitence, the rescue of sinners. First of all fasting, then sackcloth; first of all what is not seen, then what is visible; the one is always shown to God, the other sometimes to man. And if it were necessary to remove one from the two then I would rather keep fasting without sackcloth than have sackcloth without fasting. Elder men give the example which pertains to youths: for no one is without sin; and if his life only lasted one day, the years of his life would still be counted [Job 14:5. LX]. For if the stars are not pure before God, they are still more so than a worm or putrefaction, and those who are held by the sin of Adam, the great offender. Note here too the order, which is well written: God commands the prophet, the prophet proclaims to the city. First of all the men believe, announce fasting, and then everyone puts on sackcloth. The men do not announce the putting on of sackcloth, but only the fasting. All the same, with reason, those to whom penitence has been proscribed wear sackcloth and fast so that empty stomach and mourning clothes give the Lord more of an opportunity to remit.

Source: Commentary on Jonah, Chapter 3
[AD 428] Theodore of Mopsuestia on Jonah 3:5
They could never have believed in God on the basis of this remark alone, from a completely unknown foreigner threatening them with destruction and adding nothing further, not even letting the listeners know by whom he was sent. Rather, it is obvious he also mentioned God, the Lord of all, and said he had been sent by him; and he delivered the message of destruction, calling them to repentance. When they accepted instruction in this, then, they were naturally told to believe in God; when they accepted both the sentence and the instruction from the prophet’s sermon, they set their eyes on better things so as to give evidence of a decisive and serious repentance.

Source: COMMENTARY ON JONAH 3:5-9
[AD 420] Jerome on Jonah 3:6-9
"For word came unto the king of Nineveh, and he arose from his throne, and he laid his robe from him, and covered him with sackcloth, and sat in ashes. And he caused it to be proclaimed and published through Nineveh by the decree of the king and his nobles, saying, Let neither man nor beast, herd nor flock, taste any thing: let them not feed, nor drink water: But let man and beast be covered with sackcloth, and cry mightily unto God: yea, let them turn every one from his evil way, and from the violence that is in their hands. Who can tell if God will turn and repent, and turn away from his fierce anger, that we perish not?" LXX: 'the message reached the king of Nineveh, and he arose from his throne, took off his robe and covered himself with sackcloth, and he sat down upon the earth. And by the order of the king and his nobles it was announced throughout Nineveh, saying, it is forbidden for any man or beast or oxen or sheep to eat anything, to drink any water. Men and beasts were covered in sackcloth and cried out to the Lord mightily. Let each one turn away from his wicked practises and from the unfairness that was in his hands, saying, who knows if God will turn and repent, if he will not abandon the fierceness of his wrath so that we might not die?'. I know certain men for whom the king of Nineveh, (who is the last to hear the proclamation and who descends from his throne, and forgoes the ornaments of his former vices and dressed in sackcloth sits on the ground, he is not content with his own conversion, preaches penitence to others with his leaders, saying, "let the men and beasts, big and small of size, be tortured by hunger, let them put on sackcloth, condemn their former sins and betake themselves without reservation to penitence!) is the symbol of the devil, who at the end of the world, (because no spiritual creature that is made reasoning by God will perish), will descend from his pride and do penitence and will be restored to his former position. To support this opinion they use this example of Daniel in which Nebuchadnezzar after seven years of penitence is returned to his former reign. [Dan. 4:24, 29, 33] But because this idea is not in the Holy Scripture and since it completely destroys the fear of God, (for men will slide easily into vices if they believe that even the devil, the creator of wickedness and the source of all sins, can be saved if he does penitence), we must eradicate this from our spirits. Let us remember though that the sinners in the Gospel are sent to the eternal fire [Mt. 25:41], which is prepared for the devil and his angels, about whom is said, "their worm will not die and their fire will not be extinguished" [Is. 66:24]. All the same we know that God is mild, and we sinners do not enjoy his cruelty, but we read, "the Lord is kindly and righteous, and our God will be merciful" [Ps. 114:5]. The justice of God is surrounded by mercy, and it is by this route that he proceeds to judgement: he spares to judge, he judges to be merciful. "Mercy and Truth are to be found in our path; Justice and Peace are to be embraced" [Ps. 84:11]. Moreover if all spiritual creatures are equal and if they raise themselves up by their virtues to heaven, or by their vices take themselves to the depths, then after a long circuit and infinite centuries, if all are returned to their original state with the same worthiness to all conflicting, what difference will there be between the virgin and the prostitute? What distinction will there be between the mother of the Lord and (it is wicked to say) the victims of public pleasures? Will Gabriel be like the devil? Will the apostles be as demons? Will the prophets be as pseudoprophets? Martyrs as their persecutors? Imagine all that you will, increase by two-fold the years and the time, take infinite time for torture: if the end for all is the same, all the past is then nothing, for what is of importance to us is not what we are at any given moment, but what we will be forever more. I am not forgetting what is often said to argue against this point, preparing hope for oneself and some kind of safety with the devil. But this is not the appropriate time to write at length against the opinion of the wicked and against the synphragma of the devil from those who teach one thing in private only to deny it in public. It is enough for me to have shown what I believe this passage signifies, and as is appropriate in a commentary, to remark briefly who the king of Nineveh is, he who is the last to hear the word of God. Just how much eloquence and secular knowledge are worth to mankind can be seen in Demosthenes, Cicero, Plato, Xenophon, Theophrastus, Aristotle and the other philosophers and orators who are considered kings and their precepts are not taken as the work of mortals but as oracles of the gods. About which Plato says, happy are those states where philosophers rule, or if kings are philosophers. How difficult it is for such men to believe in God! I am neglecting though those examples from daily life, and pass over the stories of pagans and content myself with the text of the apostle who writes in Corinthians, saying, "look, brothers, to your vocation, among you. For there are not many who are wise about their flesh, nor many powerful, or noble. But there is much madness in the world, and this is what God has chosen to confuse wise men. That which is weak in the world, this is what God has chosen to confuse strength, and that which is in the world without good birth this is what God has chosen…" [1 Cor. 1:26-8] and again he says, "I will destroy the wisdom of the wise, and I will reprove the knowledge of those who know." [Is. 29:14; 1 Cor. 1:19] And: "see that no one robs you, through philosophy, this is a vain seduction" [Col. 2:8]. From this the predication of Christ is clear, the kings of the world hear last; then they put down the clamour of eloquence and the beautiful appearance of words, they abandon themselves completely to all simplicity and rusticity, and return to the ways of peasants, sitting in the dirt and destroying what they had formerly said was good before. Let us take as an example the benevolent Cyprian: who is firstly the champion of idolatry, and had such a reputation of good speaking that he taught the art of rhetoric at Carthage. He finishes by listening to the speech of Jonah, is converted to repent and gains such courage as to preach about Christ in public and lays his neck under the sword for him. For sure we know that the King of Nineveh descended from his throne, exchanged his red gown for sackcloth, his perfumes for mud, and cleanness for uncleanness- not uncleanness of meanings but of his words. In the same way in Jeremiah it is said about Babylon that "Babylon is a golden chalice which makes all the earth drunk" [Jer. 51:7]. Which man has not been made drunk by secular eloquence? Whose spirit has not been shot through by the composition of words and by the brightness of his elegant speech? Those powerful, noble and rich have great difficulty in believing in God; then how much more so for the masters of speech! Their spirit is blinded by riches, wealth, abundance, they are prevented by their sins and cannot see their virtues; they judge the simplicity of the Holy Scripture not on the majesty of its meanings, but out of the baseness of its words. But when they who have previously taught wickedness are converted to repent and start to teach what is good then we will see the people of Nineveh converted with a single proclamation, and the speech that we read in Isaiah will come true: "is a people thus born in one go?". [Is. 66:8. LX] Men and animals are covered with sackcloth, crying out to the Lord, this is to be understood by the same meaning as this: that those who have reason and those who do not, the wise and the simple repent according to that phrase said elsewhere: "You will save men and the animals O Lord" [Ps. 35:7]. It is possible however to interpret differently the animals covered in sackcloth, especially according to those passages in which we read, "the sun and moon will be dressed in sackcloth" [Joel 2:10], and in another passage, "I will cover the heavens with sackcloth". [Is. 50:3] This will be the clothing of mourning, the worry and sadness that are designated metaphorically by sackcloth. And this phrase: "who knows if God will turn and pardon?" places us in uncertainty and doubt. Thus men in hypothetical cleanness repent with more intent and arouse even more God's mercy.

Source: Commentary on Jonah, Chapter 3
[AD 430] Augustine of Hippo on Jonah 3:6
A king serves God one way as a man, another as a king. He serves him as a man by living according to faith. He serves Him as king by exerting the necessary strength to sanction laws that command goodness and prohibit its opposite. The king of the Ninevites served God by compelling the whole city to appease the Lord.
[AD 430] Augustine of Hippo on Jonah 3:6
A sovereign serves God one way as a man, another way as a king. He serves him as man by living according to faith. He serves him as king by exerting the necessary strength to sanction laws that command goodness and prohibit its opposite. It was thus that Ezekiel served him by destroying the groves and temples of idols and the high places that had been set up contrary to the commandments of God. Thus Josiah served him by performing similar acts. Thus the king of the Ninevites served him by compelling the whole city to appease the Lord.

Source: LETTER 185:5.19
[AD 542] Caesarius of Arles on Jonah 3:6
The king preferred to escape in a hair-shirt, rather than to perish in purple garments. We must understand, dearly beloved, that lowliness avails more than power.
[AD 407] John Chrysostom on Jonah 3:7
And inasmuch then as these would participate in the punishment, let them also do so in the fast. (Concerning Statues Homily III. 9)
[AD 465] Maximus of Turin on Jonah 3:7
The king conquered enemies with a display of valor. He conquered God, however, by humility. He is a wise king who, in order to save his people, owns himself a sinner rather than a king. He forgets that he is a king, fearing God the King of all. He does not bring to mind his own power but rather comes to possess the power of the Godhead. Marvelous! When he forgets that he is a king of men, he begins to be a king of righteousness. The prince, becoming religious, did not lose his empire but changed it. Before he held a princedom of military discipline. Now he obtained a princedom in heavenly disciplines.

Source: COMMENTARY ON JONAH
[AD 542] Caesarius of Arles on Jonah 3:7
Now why should the little children, who had committed no sin, fast? Evidently, the innocent fasted in order that sinners might escape punishment; the little child cried out that the older man might not perish. But even if the fasting of infants was necessary, why the further fasting of flocks and herds? Surely, in order that the hunger of even the animals might manifest the repentance of men.
[AD 407] John Chrysostom on Jonah 3:8
Recall that Daniel, passionate man though he was, spent many days fasting. He received as recompense an awesome vision so that he tamed the fury of the lions and turned them into the mildest of sheep, not by changing their nature but by diverting their purpose without loss of their ferocity. The Ninevites too made use of the remedy of fasting and won from the Lord a reprieve. Animals as well as human beings were included in the fast, so that all living things would abstain from evil practices. This total response won the favor of the Lord of all.

Source: HOMILIES ON GENESIS 1:7
[AD 435] John Cassian on Jonah 3:8
They had a covering of sackcloth at a time when, since all were mourning over the approaching destruction of the city and were clothed with the same garments, none could be accused of excessive display. (Institutes Bk 1.2)
[AD 1274] Thomas Aquinas on Jonah 3:8
Coarseness of attire is sometimes a sign of sorrow: wherefore those who are in sorrow want to wear coarser clothes, just as on the other hand in times of festivity and joy they wear finer clothes. Just as a man’s mind is uplifted by fine clothes, so is it humbled by lowly apparel.
[AD 220] Tertullian on Jonah 3:9
Divine repentance takes in all cases a different form from that of man, in that it is never regarded as the result of improvidence or of fickleness, or of any condemnation of a good or an evil work. For it will have no other meaning than a simple change of a prior purpose; and this is admissible without any blame even in a man, much more in God, whose every purpose is faultless. Now in Greek the word for repentance (METANOIA) is formed, not from the confession of sin, but from a change of mind, which in God we have shown to be regulated by the occurrence of varying circumstances.
[AD 407] John Chrysostom on Jonah 3:9
Consider, if God had chosen to demolish everything [in a recent earthquake], what we would have suffered. I say this, so that the fear of these events may remain sharp in you and may keep everyone’s resolution firm. He shook us, but he did not destroy us. If he had wished to destroy us, he would not have shaken us. But since he did not wish to destroy us, the earthquake came in advance like a herald, forewarning everyone of the anger of God, in order that we might be improved by fear and prevent the actual retribution.He has done this even for foreign nations. “Yet three days, and Nineveh shall be overthrown.” Why do you not overcome the city? You threaten to destroy it. Why do you not destroy it? “Because I do not wish to destroy, for this very reason I threaten.” So what is the Lord saying? “Lest I enact my impending judgment, let my word go in advance and prevent my acting.” Yet three days, and Nineveh shall be overthrown. Then the prophet spoke. Today these walls speak. I say this, and I do not cease saying it, both to the poor and to the rich: consider how great is God’s anger. Consider how simple his requirement: let us abstain from evil! In a brief moment of time he shattered the mind and resolution of each one of us. He shook the foundations of our hearts.

Source: HOMILIES ON LAZARUS AND THE RICH MAN 6
[AD 1274] Thomas Aquinas on Jonah 3:9
God is said ‘to change His mind,’ metaphorically, inasmuch as He bears Himself after the manner of one who repents, by ‘changing His sentence, although He does not change His plan.
[AD 99] Clement of Rome on Jonah 3:10
These things, dearly beloved, we are writing, not only to warn you but also to remind ourselves; for we are in the same arena, and the same contest lies before us. For this reason let us abandon empty and silly concerns and come to the glorious and holy rule of our tradition. Let us see what is good and pleasing and acceptable in the sight of our Maker. Let us fix our gaze on the blood of Christ and realize how precious it is to his Father, seeing that it was poured out for our salvation and brought the grace of conversion to the whole world. Let us look back over all the generations and learn that from generation to generation the Lord has given an opportunity of repentance to all who would return to him. Noah preached penance, and those who heeded were saved. Then Jonah announced destruction to the Ninevites and they repented of their sins, besought God in prayer and, estranged though they were from God, obtained salvation.

Source: 1 CLEMENT 7
[AD 220] Tertullian on Jonah 3:10
Now, if [forgiveness of sin had not] been predicted of Christ, I should find in the Creator examples of such benignity as would hold out to me the promise of similar affections also in the Son of whom he is the Father. I see how the Ninevites obtained forgiveness of their sins from the Creator—not to say from Christ [by way of anticipation], even then, because from the beginning he was acting in the Father’s name.

Source: AGAINST MARCION 4.10
[AD 407] John Chrysostom on Jonah 3:10
For the fear was the cause of their safety. The threatening effected the deliverance from the peril. The sentence of destruction put a stop to the destruction. O strange and astonishing event! The threatening of death brought forth life.
[AD 407] John Chrysostom on Jonah 3:10
They do not know the issue, and yet they do not neglect repentance. They are unacquainted with the method of the lovingkindness of God, and they are changed amid uncertainty. They had no other Ninevites to look to, who had repented and been saved. They had not read the prophets or heard the patriarchs, or benefited by counsel, or partaken of instruction, nor had they persuaded themselves that they should altogether propitiate God by repentance. For the threat did not contain this. But they doubted and hesitated about this, and yet they repented with all carefulness. What account then shall we give, when these, who had no good hopes held out to them as to the issue, gave evidence of such a change? [What account shall you give], who may be of good cheer as to God’s love for humanity, and have many times received pledges of his care, and have heard the prophets and apostles, and have been instructed by the events themselves, and yet you do not strive to attain the same measure of virtue as they? Great then was the virtue too of these people, but much greater was the lovingkindness of God.… That fear was the parent of salvation; the threat removed the peril; the sentence of overthrow stayed the overthrow. Now they have a new and more marvelous issue! The sentence threatening death was the parent of life.… Was Nineveh destroyed? Quite the contrary. It arose and became more glorious, and all this intervening time has not effaced its glory. And we all yet celebrate it and marvel at it, that subsequently it has become a most safe harbor to all who sin, not allowing them to sink into despair but calling all to repentance, both by what it did and by what it gained from the providence of God, persuading us never to despair of our salvation.

Source: HOMILIES CONCERNING THE STATUES 5:5-6
[AD 407] John Chrysostom on Jonah 3:10
And that these words are not a vain boast shall be made manifest to you for things that have already happened. What could be more stupid than the Ninevites? What more devoid of understanding? Yet, nevertheless, these barbarian, foolish people, who had not yet heard any one teaching them wisdom, who had never received such precepts from others, when they heard the prophet saying, “Yet three days, and Nineveh shall be overthrown,” laid aside, within three days, the whole of their evil customs. The fornicator became chaste; the bold man meek; the grasping and extortionate moderate and kind; the slothful industrious. They did not, indeed, reform one or two or three or four vices by way of remedy, but the whole of their iniquity. But where does this appear, says someone? From the words of the prophet; for the same who had been their accuser and who had said that “the cry of their wickedness has ascended up even into heaven,” himself again bears testimony of an opposite kind by saying, “God saw that every one departed from their own evil ways.” He does not say from fornication or adultery or theft, but from their “own evil ways.” And how did they depart? As God knew; not as people judged of the matter. After this are we not ashamed, must we not blush, if it turns out that in three days only the barbarians laid aside all their wickedness, but that we, who have been urged and taught during so many days, have not got the better of one bad habit? These people had moreover gone to the extreme of wickedness before; for when you hear it said, “The cry of their wickedness is come up before me,” you can understand nothing else than the excess of their wickedness. Nevertheless within three days they were capable of being transformed to a state of complete uprightness.

Source: HOMILIES CONCERNING THE STATUES 20:21
[AD 407] John Chrysostom on Jonah 3:10
They applied fasting to their wounds. Yes, they even applied extreme fasting—lying prostrate on the ground, putting on sackcloth and ashes, and lamentations. More importantly, they chose a change of life. Let us then see which of these things made them whole. And how shall we know? If we come to the physician, if we seek after him earnestly, he will not hide it from us but will even eagerly disclose it. Rather, in order that no one may be ignorant or have need to ask, he has even set down in writing the medicine that restores sinners. What then is this? “God,” he said, “saw that they turned every one from his evil way, and he repented of the evil that he said he would do unto them.” He did not say simply that he saw their fasting and sackcloth and ashes, but their behavior. I say this not to question fasting (God forbid!) but to exhort you that with fasting you do that which is better than fasting, the abstaining from all evil.

Source: HOMILIES ON 2 CORINTHIANS 4:6
[AD 420] Jerome on Jonah 3:10
"And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not." LXX: 'God saw their works since they turned from their wicked ways. And God repented for their wickedness that he had said he would do to them and he did not do it.' According to the two meanings of this passage God is threatening the town of Assyria and threatens the people of the world every day so that they repent: if they convert then he will change his judgement, and it will be changed by the conversion of the people. Jeremiah and Ezekiel explain this more clearly: the Lord has not fulfilled the good that he has promised to do if the good turn to sinners; nor the wickedness that he threatened the wicked if they return to safety. Thus now God sees their works, since they turn from their wicked way. But he did not hear those vain promises that Israel was in the custom of making: "all that God has said, we shall do" [Ex. 24:3.7], but he sees the works. And because he prefers a sinner's repentance rather than his death [Ez. 33:11.] he willingly changes his sentence because he has seen a change in the works. Or rather God has continued in his proposition, since he wanted to pity right from the beginning. No one in fact who desires to punish, threatens what he will actually do. The word 'wickedness' as we have noted above, can be taken to mean supplication or torture, not that God could think to do nothing on account of the wickedness.

Source: Commentary on Jonah, Chapter 3
[AD 430] Augustine of Hippo on Jonah 3:10
In uncertainty they repented and obtained certain mercy.

Source: EXPLANATION OF THE PSALMS 50
[AD 865] Haimo of Auxerre on Jonah 3:10
For if the world is converted, God is converted; and when the sinners change their life, He will change His sentence.