Proverbs 27:17-23

As iron sharpens iron, So a man sharpens the countenance of his friend. Whoever keeps the fig tree will eat its fruit; So he who waits on his master will be honored. As in water face reflects face, So a man’s heart reveals the man. Hell and Destruction are never full; So the eyes of man are never satisfied. The refining pot is for silver and the furnace for gold, And a man is valued by what others say of him. Though you grind a fool in a mortar with a pestle along with crushed grain, Yet his foolishness will not depart from him. Be diligent to know the state of your flocks, And attend to your herds