The prophet Jonah was angry after God’s grace came to the Gentile city of Nineveh, when they repented and avoided disaster:
“But it displeased Jonah exceedingly, and he was angry. And he prayed to the LORD and said, ‘O LORD, is not this what I said when I was yet in my country? That is why I made haste to flee to Tarshish; for I knew that you are a gracious God and merciful, slow to anger and abounding in steadfast love, and relenting from disaster. Therefore now, O LORD, please take my life from me, for it is better for me to die than to live.’ And the LORD said, ‘Do you do well to be angry?’” – Jonah 4:1-4

Jonah claimed to know God’s character, but also wanted to determine who else could know God and who couldn’t, who gets “justice” and who doesn’t, preventing him from rejoicing in the salvation of Nineveh.

Do we do well to be angry, or do we prefer joy in knowing the God who is sovereign knows what He’s doing? Be glad in the salvation of God, even if He gives it to someone you don’t think deserves it. He knows better.