Well-timed silence hath more eloquence than speech. – Martin Farquhar Tupper, “Of Discretion,” Proverbial Philosophy

The easiest way to save face is to keep the lower half shut. – Author Unknown

And there is monologue disguised as dialogue, in which two or more men, meeting in space, speak each with himself in strangely tortuous and circuitous ways and yet imagine they have escaped the torment of being thrown back on their own resources. – Martin Buber (1878—1965), translated from German

The trouble with her is that she lacks the power of conversation but not the power of speech. – George Bernard Shaw