Jonah ran from the call to preach in Nineveh because he suspected what would happen. When he finally went, the city fasted from the king down to the cattle, and God spared it. Jonah sat outside the walls, furious, and told God the reason he had fled: he knew God was gracious and merciful, slow to anger, and abounding in steadfast love.
God grew a plant to shade him, then let it wither, and Jonah grieved for the plant. The book ends with a question God puts to Jonah and to every reader: should God not pity a city of a hundred and twenty thousand people who cannot tell their right hand from their left? The Church reads Jonah at the start of Lent. The mercy we resent for our enemies is the mercy we are living on.
And should not I pity Nineveh, that great city, in which there are more than a hundred and twenty thousand persons who do not know their right hand from their left, and also much cattle?
Jonah 4:11, RSV-CE