Secrets define us, they mark us, they set us apart from all the others. The secrets which we preserve provide a key to who we are, deep down.

Nothing is hidden from the eyes of the observing world.

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

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

There is a sickness among tyrants: they cannot trust their friends.

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.

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

Secrecy lies at the very core of power.

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

There is nothing more deceptive than an obvious fact.

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.