Proverbs 27:17-21

As iron sharpens iron, so people can improve each other. Whoever tends a fig tree gets to eat its fruit, and whoever takes care of his master will receive honor. As water reflects your face, so your mind shows what kind of person you are. People will never stop dying and being destroyed, and they will never stop wanting more than they have. A hot furnace tests silver and gold, and people are tested by the praise they receive.