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

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

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

Once suspicion is aroused, everything feeds it.

Nothing is hidden from the eyes of the observing world.

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

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

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

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

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

There is nothing more deceptive than an obvious fact.

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

There is nothing makes a man suspect much, more than to know little.