In Jonah 4:1–4, Jonah’s anger exposes a heart resistant to God’s mercy. God’s compassion toward Nineveh should have led to worship, but instead it revealed Jonah’s pride and self-righteousness. This passage reminds us that God’s mercy tests our hearts. Will it make us resentful, or will it remind us of our own need? Those who cherish mercy are led to humble worship before our gracious and patient God.