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

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

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

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.

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

Once suspicion is aroused, everything feeds it.

We must not always talk in the marketplace of what happens to us in the forest.

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

Nothing is hidden from the eyes of the observing world.

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

Even a paranoid can have enemies.

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

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