Proverbs 14:7 - Ellicott's Commentary On The Whole Bible

Go from the presence of a foolish man — (khesîl) — i.e. a dull, stupid one, when the time comes that you see you can do him no good; for “evil communications corrupt good manners.” Thus Samuel “came no more to see Saul,” when he saw that remonstrances were unavailing with him, though he continued to “mourn” for him, remembering from what high estate he had fallen.