Ecclesiastes 10:10-14

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.

Surely the serpent will bite without enchantment; and a babbler is no better.

The words of a wise man’s mouth are gracious; but the lips of a fool will swallow up himself.

The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.

A fool also is full of words: a man cannot tell what shall be; and what shall be after him, who can tell him?