Nothing is hidden from the eyes of the observing world.

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

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

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

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

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.

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

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

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

A regime which combines perpetual surveillance with total indulgence is hardly conducive to healthy development.

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

There is nothing more deceptive than an obvious fact.