15 Folly is bound up in the heart of a child:
the rod of discipline drives it far from him.

Matthew Henry's Commentary on Proverbs 22:15

Commentary on Proverbs 22:15

(Read Proverbs 22:15)

Sin is foolishness, it is in the heart, there is an inward inclination to sin: children bring it into the world with them; and it cleaves close to the soul. We all need to be corrected by our heavenly Father.