This is one of the bluntest proverbs in the book: some people's foolishness is so deeply entrenched that no external force — not pressure, punishment, or suffering — will remove it. The only change that removes deep foolishness is a changed heart, which only God can give. This is a warning about the limits of correction without repentance and transformation.
Memory phrase: Only God can change a fool's heart.
Talk about it: Why can foolishness be so hard to change? What does only God have the power to do?
Prayer: God, change my heart so foolishness does not rule me.