The one who has knowledge uses words with restraint, and whoever has understanding is even-tempered.
Read Proverbs 17:27 Using Other Translations
He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.
Whoever restrains his words has knowledge, and he who has a cool spirit is a man of understanding.
A truly wise person uses few words; a person with understanding is even-tempered.
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(New International Version Bible Online)