Adam Clarke on Proverbs 3:11

Despise not the chastening of the Lord - The word מוסר musar signifies correction, discipline, and instruction. Teaching is essentially necessary to show the man the way in which he is to go; discipline is necessary to render that teaching effectual; and, often, correction is requisite in order to bring the mind into submission, without which it cannot acquire knowledge. Do not therefore reject this procedure of God; humble thyself under his mighty hand, and open thy eyes to thy own interest; and then thou wilt learn specially and effectually. It is of no use to rebel; if thou do, thou kickest against the pricks, and every act of rebellion against him is a wound to thine own soul. God will either end thee or mend thee; wilt thou then kick on?