Charles Spurgeon Commentary Proverbs 27:22

"Though thou shouldest bray a fool in a mortar with a pestle along with bruised grain, Yet will not his foolishness depart from him." — Proverbs 27:22 (ASV)

No troubles, no afflictions, can of themselves make a fool into a wise man. The sinner remains a sinner, after all providential chastisements, unless sovereign grace interposes.