Ecclesiaste 10:11LXX

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

10If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom profitable to direct.

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

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

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