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.

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

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

There is nothing more deceptive than an obvious fact.

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

Nothing is hidden from the eyes of the observing world.

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

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