Ecclesiastes 10:8–11

8 He that diggeth a pit shall fall into it; and whoso breaketh an hedge, a serpent shall bite him. 9 Whoso removeth stones shall be hurt therewith; and he that cleaveth wood shall be endangered thereby. 10 If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct. 11 Surely the serpent will bite without enchantment; and a babblerd is no better.