Ecclesiastes 10:9-11

Young's Literal Translation

⁹ Whoso is removing stones is grieved by them, Whoso is cleaving trees endangered by them.

¹⁰ If the iron hath been blunt, And he the face hath not sharpened, Then doth he increase strength, And wisdom [is] advantageous to make right.

¹¹ If the serpent biteth without enchantment, Then there is no advantage to a master of the tongue.