The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
– Proverbs 15:2
The tongue and mouth here are figures for speech, spoken words. The word for useth … aright means skillfully, or to do well. The words a wise man uses are thoughtful and deliberately chosen (Proverbs 15:28; 16:23). He has control over his tongue, which means his words will also be fewer (Proverbs 17:28). The contrast is with fools who poureth out, or gush forth, foolishness. Fools are quick to speak, which means their words are thoughtless (Proverbs 29:20). Fools also pour out a great quantity of words without restraint (Proverbs 10:19; 15:28; 29:11; Ecclesiastes 10:14).