Proverbs 27:17-22

Iron sharpeneth iron;
So a man sharpeneth the countenance of his friend.
Whoso keepeth the fig tree shall eat the fruit thereof:
So he that waiteth on his master shall be honoured.
As in water face answereth to face,
So the heart of man to man.
Hell and destruction are never full;
So the eyes of man are never satisfied.
As the fining pot for silver, and the furnace for gold;
So is a man to his praise.
Though thou shouldest bray a fool in a mortar among wheat with a pestle,
Yet will not his foolishness depart from him.