Ambrose of Milan

Now what ought we to learn before everything else, but to be silent that we may be able to speak? Lest my voice should condemn me before that of another acquits me, for it is written: "By your words you shall be condemned." What need is there, then, that you should hasten to undergo the danger of condemnation by speaking when you can be more safe by keeping silent? How many have I seen to fall into sin by speaking, but scarcely one by keeping silent; and so it is more difficult to know how to keep silent than how to speak … a person is wise, then, who knows how to keep silent. Lastly, the Wisdom of God said, "The Lord has given to me the tongue of learning, that I should know when it is good to speak." Justly, then, is one wise who has received of the Lord to know when he ought to speak. Wherefore the Scripture says well: "A wise person will keep silence until there is opportunity."