Proverbs 15:14

The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness.
– Proverbs 15:14

The word for seeketh means to search out and indicates a deliberate search. The word for knowledge means cunning, perception, and discernment. Proverbs presents wisdom as accessible to all (Proverbs 8:1-11; 9:1-6), but acquired only by those who seek for it (Proverbs 2:1-6). One of the marks of wisdom is to continue to seek for wisdom (Proverbs 1:5; 9:9). The contrast speaks of feeding on foolishness rather than seeking wisdom. The word for feedeth means to pasture, or graze. The word for fools is the most common word in Proverbs for fools. The word means stupid and obstinate. The usage in Proverbs shows the word describes one who chooses the way of folly and not one who is mentally impaired. The fool gobbles up foolishness and spews it out freely (Proverbs 15:2). The fool has no heart or patience for acquiring wisdom (Proverbs 17:6, 24). He prefers his easy foolishness so much he returns to it like a dog to its own vomit (Proverbs 26:11).

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Proverbs 15:2

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).

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