Proverbs 27:17-21

You use steel to sharpen steel, and one friend sharpens another. If you care for your orchard, you’ll enjoy its fruit; if you honor your boss, you’ll be honored. Just as water mirrors your face, so your face mirrors your heart. Hell has a voracious appetite, and lust just never quits. The purity of silver and gold is tested by putting them in the fire; The purity of human hearts is tested by giving them a little fame.