John Chrysostom
Jonah was cast out of the great fish and emerged in Nineveh, while Christ entered the world proclaiming the message of repentance. In essence, genuine existence is often compared to the depths of the ocean.
If you are willing, let us recount the tale itself. It is written, “the word of the Lord came to Jonah, saying, Arise, go to Nineveh, that great city” (Jonah 1:1-2). God, anticipating the prophet's attempt to flee, aims from the outset to stir Jonah's compassion by the enormity of the city. Now, let us also consider the proclamations. “Yet forty days, and Nineveh shall be overthrown!” Why do you announce the calamity you intend to inflict? For I will not carry out what I foretell. This is why He threatened with the fires of Gehenna, to prevent you from being led astray: let your hearts be alarmed by the words, not grieved by the actions. Why does He set such a brief time limit?
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So that you might also recognize the repentance of the foreigners—the Ninevites—who, in a matter of three days, could appease God’s anger over their transgressions. You were astonished at the mercy of God, who found pleasure in three days of repentance for such significant sins, and you yourself would not succumb to despair, even though your own transgressions were countless.