King James Version (KJV)
He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.
Modern English
Whoever restrains his words has knowledge, and he who has a cool spirit is a man of understanding.
Hebrew
חוֹשֵׂ֣ךְ אֲ֭מָרָיו יוֹדֵ֣עַ דָּ֑עַת וְקַר ר֝֗וּחַ אִ֣ישׁ תְּבוּנָֽה׃
ḥvoshek ʾamarayv yvodeʿa daʿat vqar rvḥa ʾiysh tbvnah