Ecclesiastes 10:8-11

⁸He that diggeth a pit will fall into it; and him who breaketh down a fence—a serpent will bite him.

⁹Whoso removeth stones will be hurt through them; and he that cleaveth wood will be endangered thereby.

¹⁰If the iron be blunt, and man do not whet the edge, then must he exert more strength; but the advantage of making it properly sharp is wisdom.

¹¹If the serpent do bite because no one uttered a charm, then hath the man that can use his tongue in charming no preference.—