Common sense (which, in truth, is very uncommon) is the best sense I know of: abide by it; it will counsel you best.
Lord ChesterfieldNever 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.
Lord ChesterfieldLearn to shrink yourself to the size of the company you are in. Take their tone, whatever it may be, and excell in it if you can;but never pretend to give the tone. A free conversation will no more bear a dictator than a free government will.
Lord Chesterfield