“Though you grind a fool in a mortar with a pestle along with crushed grain, yet his foolishness will not depart from him.” (Proverbs 27:22, NKJV)
The proverb depicts a process of separating the husk from the kernel of grain in a manner that is more intricate and careful than the usual threshing process. (The word “grind” means “to pound or beat small.”) Pulpit Commentary notes in this proverb “is expressed the idea that the most elaborate pains are wasted on the incorrigible fool…an obstinate, self-willed, unprincipled man cannot be reformed by any means; his folly has become his second nature, and is not to be eliminated by any teaching, discipline, or severity” (Proverbs, 519). Although pounding and grinding grain yields its intended results, you cannot beat foolishness out of a fool. You cannot pound the truth of God into a heart that is hardened by sin against it. Perhaps this is one of the reasons why it is said to be “impossible…to renew them again to repentance” who have tasted heaven’s sweet goodness and then fallen away from the Lord (Hebrews 6:4-6). Unless and until the obstinate heart softens toward God and toward His truth, the sinner will go on, unaffected by efforts to separate him (or her) from the foolishness of his sin. “Today, if you will hear His voice, do not harden your heart” (Hebrews 3:7-8)!