Better a slip on the stone floor than a slip of the tongue.
--"Ecclessius" (20:18)

He who knows, does not talk; he who talks, does not know.
--Lao Tze (Taoist)

He who truly knows, has no occasion to shout.
--Leonardo di Vinci

At a dinner party we should eat wisely, but not too well; and talk well, but not too wisely.
--Somerset Maugham