Ecclesiastes 10:8-12

⁸He who digs a pit may fall into it; and whoever breaks through a wall may be bitten by a snake.

⁹Whoever carves out stones may be injured by them. Whoever splits wood may be endangered by it.

¹⁰If the axe is blunt, and one doesn’t sharpen the edge, then he must use more strength; but skill brings success.

¹¹If the snake bites before it is charmed, then is there no profit for the charmer’s tongue.

¹²The words of a wise man’s mouth are gracious; but a fool is swallowed by his own lips.