Whenever anything is spoken against you that is not true, do not pass by or despise it because it is false; but forthwith examine yourself, and consider what you have said or done that may administer a just occasion of reproof.
PlutarchIt is wise to be silent when occasion requires, and better than to speak, though never so well.
PlutarchThe process may seem strange and yet it is very true. I did not so much gain the knowledge of things by the words, as words by the experience I had of things.
Plutarch