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.

¹⁰ If the iron be blunt, and one do not whet the edge, then must he apply more strength; but wisdom is profitable to give success.

¹⁰ If the axe is dull and he does not sharpen its edge , then he must exert more strength . Wisdom has the advantage of giving success .