Ecclesiastes 10:1-3; Ecclesiastes 10:12-15

1 Dying flies spoil the sweetness of the ointment. Wisdom and glory is more precious than a small and shortlived folly. 2 The heart of a wise man is in his right hand, and the heart of a fool is in his left hand. 3 Yea, and the fool when he walketh in the way, whereas he himself is a fool, esteemeth all men fools.
12 The words of the mouth of a wise man are grace: but the lips of a fool shall throw him down headlong. 13 The beginning of his words is folly, and the end of his talk is a mischievous error. 14 A fool multiplieth words. A man cannot tell what hath been before him: and what shall be after him, who can tell him? 15 The labour of fools shall afflict them that know not how to go to the city.