Mishle 27:21-23

Orthodox Jewish Bible

²¹ As the crucible is for kesef, and the furnace for zahav; so is an ish tested by the praise he receives.

²² Though thou shouldest grind a fool in the makhtesh (mortar) among grain with the pestle, yet will not his folly be removed from him.

²³ Be thou diligent to know the condition of thy tzon, and look well to thy adarim (flocks).