If you have hitherto concealed this sight, let it be tenable in your silence still, and whatsoever else shall hap tonight, give it an understanding but no tongue.
Have more than thou showest, Speak less than thou knowest, Lend less than thou owest, Ride more than thou goest, Learn more than thou trowest, Set less than thou throwest.
Questions are never indiscreet. Answers sometimes are.
Philosophy is nothing but discretion.
Never tell all you know – not even to the person you know best.
Never part with information unnecessarily.
It’s so much nicer to be a secret and delightful sin to anybody than to be a feather in their cap.
Inestimable harm may be done by foolish wagging of tongues in ill-natured gossip.
Give thy thoughts no tongue.
Give every man thine ear, but few thy voice.[Modern text:]Listen to many people, but talk to few.
Discretion is the best form of calculation.[La discrétion est le plus habile des calculs.]