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.

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

Even a paranoid can have enemies.

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

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.

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

Nothing is hidden from the eyes of the observing world.

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