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.
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Caesarius of Arles
AD 542
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.
Journey. He records what he said the first day, though he seems to have preached many (Theodoret) even during forty days, after which time (Haydock) he expected the city would fall, and therefore retired out of the walls, chap. iv.
Forty. Septuagint three. St. Justin Martyr, (Dialogue with Trypho) "three, or forty-three. "Theodoret thinks that the mistake was made by some ancient transcriber, and has since prevailed in all the copies of the Septuagint. All the rest have forty. St. Augustine (City of God xviii. 44.) believes the Septuagint placed three for a mysterious reason. Origen (hom. xvi. Num.) suggests that the prophet determined the number, and hence God did not execute the threat. (Calmet)
This and many other menaces are conditional. If men repent, God will change his sentence. (St. Chrysostom; St. Gregory, Mor. xvi. 18.) (Worthington)
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 transgres...
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)