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

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

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

Once suspicion is aroused, everything feeds it.

Even a paranoid can have enemies.

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

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

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

There is nothing more deceptive than an obvious fact.

Secrecy lies at the very core of power.

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

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.

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