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

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

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

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

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

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

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

There is nothing more deceptive than an obvious fact.

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

Secrecy lies at the very core of power.

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.

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

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