Matthew Poole and continuators on Proverbs 17:27

27 He that hath knowledg spareth his words, and a man of understanding is of an excellent spirit .

Heb. restraineth, as at other times, so especially when he is provoked to passion, in which case fools utter all their mind.

Which he sheweth by commanding his passions, and bridling himself from hasty and unadvised speeches. Or, as others render it, is of a cool Spirit, calm and moderate, not easily provoked, humble, as the Chaldee renders it, patient or long-suffering, as the LXX and Arabick Interpreters render the words. Or, as others, sparing (Heb. precious, which is put for rare or scarce, 1 Sam. 3. 1. Prov. 25. 17. Isa. 13. 12.) of his breath, i. e. of his speech, as this very word is used, Prov. 29. 11. Isa. 11. 4. compared with 2 Thes. 2. 8.

Marginal references: Jam. 1. 19.; Or, a cool spirit.