Passage
He that hath knowledge spareth his words; and a man of understanding is of a cool spirit.
He that hath knowledge spareth his words; and a man of understanding is of a cool spirit.
Proverbs 17:25 A foolish son is a grief to his father, and bitterness to her that bore him.
Proverbs 17:26 To punish a righteous [man] is not good, nor to strike nobles because of [their] uprightness.
Proverbs 17:27 He that hath knowledge spareth his words; and a man of understanding is of a cool spirit.
Proverbs 17:28 Even a fool when he holdeth his peace is reckoned wise, [and] he that shutteth his lips, intelligent.
The verse centers on "Spirit", "hath", "knowledge", "spareth", "words", "understanding", and "cool". It is saying that the verse draws attention to "Spirit" and "hath", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 26's "To punish a righteous man is not..." into verse 28's "Even a fool when he holdeth his...", so "Spirit" and "hath" belong inside that flow. In Proverbs context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "Spirit" and "hath" with trust shaped by these words, not by a vague optimism outside the passage.