We must not always talk in the marketplace of what happens to us in the forest.

Secrecy lies at the very core of power.

Once suspicion is aroused, everything feeds it.

There is a sickness among tyrants: they cannot trust their friends.

There is nothing more deceptive than an obvious fact.

For sooner will men hold fire in their mouths than keep a secret.

I will never again command an army in America if we must carry along paid spies. I will banish myself to some foreign country first.

The life of spies is to know, not be known.

Nothing is hidden from the eyes of the observing world.