The Rule of St. Benedict - Chapter 7. Humility

(60) The eleventh step of humility is that a monk speaks gently and without laughter, seriously and with becoming modesty, briefly and reasonably, but without raising his voice,
(61) as it is written, "A wise man is known by his few words."

中文請參：http://stbenedictineoblatestw.blogspot.com/2009/02/60-61-1727.html

Remarks:

Proverb 17:27
[Christian Community Bible - Catholic Pastoral Edition] The prudent of speech are wise; he who keeps his temper is an educated man.
[Catholic - New American Bible] He who spares his words is truly wise, and he who is chary of speech is a man of intelligence.