John Chrysostom
If you wish, we can recount the narrative itself. It is written that the word of the Lord came to Jonah, saying, "Arise, go to Nineveh, that great city" (Jonah 1:1-2). God, aware of the prophet's intention to flee, aims from the outset to instill compassion in Jonah by highlighting the significance of the city. Let us also consider the messages being proclaimed: "Forty days more and Nineveh will be overthrown!" Why speak in advance of the calamity you intend to bring? For what I declare may not come to pass. This is why He warned of Gehenna, so that you may not be led there: let words serve as a source of fear while actions should not bring sorrow. Why is such a brief period specified?
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So that you might recognize the righteousness of the outsiders—the Ninevites—who were able to appease God's wrath with only three days of repentance for their grievous sins. You marvel at the mercy of God, who accepted such a short time for repentance given their severe transgressions, while you yourself may avoid despair despite your multitude of sins.