Proverbs 19:25

Smite a scorner, and the simple will beware
That is, give reproof to a man that scoffs at religion, and makes a jest of all that is good; for though it may be of no use to him who will despise it, yet it may be observed, and be useful to another that hears it; who, though void of understanding, yet not hardened in impiety as the other, but open to conviction, "will become cunning" ^F24, as it may be rendered; or learns wisdom, and becomes hereby a knowing and understanding man; he hears another reproved, and fears, and becomes a wise man; so that though reproof may be lost on one, it succeeds in another, which is an encouragement to give it; and reprove one that hath understanding, [and] he will understand
knowledge;
he will grow wiser and wiser; he will improve in the knowledge of things; see ( Proverbs 9:8 ) .