Never seem wiser, nor more learned, than the people you are with. Wear your learning, like your watch, in a private pocket: and do not merely pull it out and strike it; merely to show that you have one.
Wear your knowledge like your watch - in you pocket - and don't pull it out just for show.
We are hardly ever grateful for a fine clock or watch when it goes right, and we pay attention to it only when it falters, for then we are caught by surprise. It ought to be the other way about.
Pocket all your knowledge with your watch, and never pull it out in company unless desired.