I will begin to speak when I have that to say which had not better be unsaid.
Marcus Porcius Cato Uticensis
I think everyone holds back. I am always censoring myself and I'm sorry about it. But I always have to consider whether my remarks might cause someone pain.
Words empty as the wind are best left unsaid.
Say not always what you know, but always know what you say.
I have never been hurt by what I have not said.
He that hath knowledge spareth his words.
It is only too easy to make suggestions and later try to escape the consequences of what we say.
The finest command of language is often shown by saying nothing.
I've always been a guy who's reserved my words for the right time.
It is well for one to know more than he says.
The unspoken word never does harm.
Put a bridle on thy tongue; set a guard before thy lips, lest the words of thine own mouth destroy thy peace... on much speaking cometh repentance, but in silence is safety.
'Tis not every question that deserves an answer.