"Letter to His Son" by Lord Chesterfield
"Talk often, but never long: in that case, if you do not please, at least you are sure not to tire your hearers. Tell stories very seldom, and absolutely never but where they are very apt and very short. Omit every circumstance that is not material, and beware of digressions. To have frequent recourse to narrative betrays a great want of imagination. Never hold anybody by the button, or the hand, in order to be heard out; for if people are not willing to hear you, you had much better hold your tongue than them. Avoid as much as you can, in mixed companies, argumentative conversations. But if the conversation grows warm and noisy, endeavor to put an end to it, by some genteel levity or joke. Above all things, and upon all occasions, avoid speaking of yourself, if it be possible. Such is the natural pride and vanity of our hearts that it perpetually breaks out, even in people of the best parts. Alway slook people in the fa...