10. If the iron be blunt, and one do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.
11. If the serpent bite before it be charmed, then is there no advantage in the charmer.
12. The words of a wise man's mouth are gracious; but the lips of a fool will swallow up himself.
13. The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.