Eclesiastés 10

If, blunt, be the iron, and, himself, hath not sharpened, the edge, then, much force, must he apply,—but, an advantage for giving success, is wisdom.

Si se embotare el hierro, y su filo no fuere amolado, hay que añadir entonces más fuerza: empero excede la bondad de la sabiduría.

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.

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