A prudent man conceals knowledge: but the heart of fools proclaims foolishness.
Proverbs 10:19 In the multitude of words there wants not sin: but he that refrains his lips is wise.
Proverbs 11:13 A talebearer reveals secrets: but he that is of a faithful spirit conceals the matter.
Proverbs 13:16 Every prudent man deals with knowledge: but a fool lays open his folly.
Proverbs 15:2 The tongue of the wise uses knowledge aright: but the mouth of fools pours out foolishness.
Ecclesiastes 10:3,12-14 Yes also, when he that is a fool walks by the way, his wisdom fails him, and he said to every one that he is a fool...