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

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

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

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

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

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

Even a paranoid can have enemies.

Once suspicion is aroused, everything feeds it.

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