Ecclesiastes 10:9-13

⁹Whoever removeth stones shall be hurt by them; and he that cleaveth wood shall be endangered by it.

¹⁰If the iron is blunt, and he doth not whet the edge, then must he use more strength: but wisdom is profitable to direct.

¹¹Surely the serpent will bite without enchantment; and a babbler is no better.

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

¹³The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.