Though you grind a fool in a mortar, grinding them like grain with a pestle, you will not remove their folly from them.
NMVThough youi should pound on a fool in a mortar among wheat with a pestle, [yet] will not his foolishness depart from him.
OJBThough thou shouldest grind a fool in the makhtesh (mortar) among grain with the pestle, yet will not his folly be removed from him.
RVThough thou shouldest bray a fool in a mortar with a pestle among bruised corn, yet will not his foolishness depart from him.
T4TEven if you beat/crush a fool severely like [MET] you pulverize grain with a pestle, you probably will not be able to cause him to stop ◄being foolish/doing foolish things►.