Ecclesiastes 10:9-14

⁹Whoso removeth stones is hurt therewith; he that cleaveth wood is endangered thereby.

¹⁰If the iron be blunt, and one do not whet the edge, then must he apply more strength; but wisdom is profitable to give success.

¹¹If the serpent bite before enchantment, then the charmer hath no advantage.

¹²The words of a wise man's mouth are gracious; but the lips of a fool swallow up himself.

¹³The beginning of the words of his mouth is folly; and the end of his talk is mischievous madness.

¹⁴And the fool multiplieth words: yet man knoweth not what shall be; and what shall be after him, who will tell him?