Once a word has been allowed to escape, it cannot be recalled. – Horace

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it should be. – Edgar Allan Poe

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