Ecclesiastes 10

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.
14 A fool also is full of words: a man cannot tell what shall be; and what shall be after him, who can tell him?
15 The labour of the foolish wearieth every one of them, because he knoweth not how to go to the city.