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

Secrecy lies at the very core of power.

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.

Once suspicion is aroused, everything feeds it.

Nothing is hidden from the eyes of the observing world.

A regime which combines perpetual surveillance with total indulgence is hardly conducive to healthy development.

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

There is nothing more deceptive than an obvious fact.

The first duty of a good inquisitor is to suspect especially those who seem sincere to him.