Proverbs 27:21-23

²¹The fining-pot is for silver, and the furnace for gold; so let a man be to the mouth that praiseth him.

²²If thou shouldest bray a fool in a mortar among wheat with a pestle, yet will not his folly depart from him.

²³Be well acquainted with the appearance of thy flocks; look well to thy herds: