Once suspicion is aroused, everything feeds it.

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

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

Even a paranoid can have enemies.

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

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

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

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.