There is a sickness among tyrants: they cannot trust their friends.

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

Nothing is hidden from the eyes of the observing world.

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

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

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

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

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

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