Adam Clarke's Commentary on the Bible

Verse 7 (Proverbs 9:7)

He that reproveth a scorner - לץ lets , the person who mocks at sacred things; the libertine, the infidel; who turns the most serious things into ridicule, and, by his wit, often succeeds in rendering the person who reproves him ridiculous. Wisdom seems here to intimate that it is vain to attempt by reproof to amend such: and yet we must not suffer sin upon our neighbor; at all hazards, we must deliver our own soul. But no reproof should be given to any, but in the spirit of love and deep concern; and when they contradict and blaspheme, leave them to God.

- Adam Clarke's Commentary on the Bible