“Let it suffice that just as a good soldier knows how to tell the smith what shape, style, and quality his armor must have, and yet it not able to teach him to make it, nor how to hammer or temper it; just so I, perhaps, shall be able to tell you what a perfect Courtier should be, but not to teach you what you must do to become one.”
(Castiglione, The Book of the Courtier, Norton Critical Edition 31)