Nothing is hidden from the eyes of the observing world.

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

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.

Once suspicion is aroused, everything feeds it.

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

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 a sickness among tyrants: they cannot trust their friends.

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

Secrecy lies at the very core of power.

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

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

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