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A fool uttereth all his mind: but a wise man keepeth it in till afterwards.
– Proverbs 29:11
A fool’s speech is not marked only by quantity, but also by content, all his mind. A fool is compelled to make his foolishness known (Proverbs 12:32; 13:16; 14:33). Such characteristic speaking is a product of the lack of self-control, particularly in terms of anger (Proverbs 12:16).
Most of the verses referenced have the contrasting characteristic of the wise that he has control over his tongue. The wise will understand many reasons for restraining speech: provide less to be used against him (Proverbs 10:14; 13:3), maintain relationships (Proverbs 11:12-13), calm heated tempers (Proverbs 17:27; 15:1), and even to lessen sin (Proverbs 10:19).
That a wise man keeps his words in till afterwards, can provide a cooling off period until minds are more reasonable, but also speaks to the characteristic wisdom of taking time to investigate, understand, and formulate a reasonable response (Proverbs 15:28; 18:13, 17).