Attain and maintain a reputation, for it is the usufruct of fame. A stiff climb, for it is the issue of excellence, as rare as mediocrity is common.

He that communicates his secret to another makes himself that other's slave.

Courtesy is the politic witchery of great personages.

Most do violence to their natural aptitude, and thus attain superiority in nothing.

Nature often lets us down when we most need her; let us turn to art.

Knowledge without wisdom is double folly.

You should avoid making yourself too clear even in your explanations.