Aphorism #237 Never share the Secrets of your Superiors.

You may think you will share pears, but you will only share parings. Many have been ruined by being confidants: they are like sops of bread used as forks, they run the same risk of being eaten up afterwards. It is no favour in a prince to share a secret: it is only a relief. Many break the mirror that reminds them of their ugliness. We donot like seeing those who have seen us as we are: nor is he seen In a favourable light who has seen us in an unfavourable one. None ought to be too much beholden to us, least of all one of the great, unless it be for benefits done him rather than for such favours received from him. Especially dangerous are secrets entrusted to friends. He that communicates his secret to another makes himself that other's slave. With a prince this is an intolerable position which cannot last. He will desire to recover his lost liberty, and to gain it will overturn everything, including right and reason. Accordingly neither tell secrets nor listen to them.

More...