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

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

There is nothing more deceptive than an obvious fact.

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

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.

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

It was funny how I could feel all alone and under surveillance at the same time.

Once suspicion is aroused, everything feeds it.