Ambrose of Milan

Let there be a door to your mouth, that it may be shut when need arises, and let it be carefully barred, that none may rouse your voice to anger, and you pay back abuse with abuse. You have heard it read today: "Be angry, and sin not." Therefore although we are angry (this arising from the motions of our nature, not of our will), let us not utter with our mouth one evil word, lest we fall into sin; but let there be a yoke and a balance to your words, that is, humility and moderation, that your tongue may be subject to your mind. Let it be held in check with a tight rein; let it have its own means of restraint, whereby it can be recalled to moderation; let it utter words tried by the scales of justice, that there may be seriousness in our meaning, weight in our speech and due measure in our words.