Three may keep a secret, if two of them are dead.

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

Once suspicion is aroused, everything feeds it.

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

Guard more faithfully the secret which is confided to you than the money which is entrusted to your care.

There is nothing more deceptive than an obvious fact.

Secrets are rarely betrayed or discovered according to any program our fear has sketched out.

Nothing is hidden from the eyes of the observing world.

Secrecy lies at the very core of power.

It was funny how I could feel all alone and under surveillance at the same time.

To know all is not to forgive all. It is to despise everybody.

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

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