Wear your learning, like your watch, in a private pocket; and do not pull it out and strike it, merely to show that you have one. If you are asked what o’clock it is, tell it; but do not proclaim it hourly and unasked, like the watchman.

Lord Chesterfield (1694-1773) English statesman, wit [Philip Dormer Stanhope]

Letter to his son, #142 (22 Feb 1748)
    (Source)