Once suspicion is aroused, everything feeds it.

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

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

Spies are of no use nowadays. Their profession is over. The newspapers do their work instead.

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

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

If the world were good for nothing else, it is a fine subject for speculation.

There is nothing makes a man suspect much, more than to know little.

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

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

Even a paranoid can have enemies.

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

Secrecy lies at the very core of power.