Whoever moderates his words is learned and prudent. And a man of learning has a precious spirit
Other versions
King James Version
He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit. English Standard Version
Whoever restrains his words has knowledge, and he who has a cool spirit is a man of understanding.New International Version
A man of knowledge uses words with restraint, and a man of understanding is even-tempered.