If you don't say it you will not have to unsay it. It takes two to have an argument. Keep your mouth shut and your eyes open. Many a true word spoken in jest. Silence is an excellent remedy against slander.
Silence is golden.
Silence is less injurious than a bad reply. Speak clearly, if you speak at all. Stop beating around the bush. Take your wife's first advice. Talking comes by nature, silence by wisdom.