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

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

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

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

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

There is nothing more deceptive than an obvious fact.

If you read somebody’s diary, you get what you deserve.

Nothing is hidden from the eyes of the observing world.

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

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

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.

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