Proverbs 15:14 in the King James Version
The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness.
Context
13 A glad heart makes a cheerful face, but an aching heart breaks the spirit.
14 The heart of one who has understanding seeks knowledge, but the mouths of fools feed on folly.
15 All the days of the afflicted are wretched, but one who has a cheerful heart enjoys a continual feast.