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

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

Once suspicion is aroused, everything feeds it.

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

Even a paranoid can have enemies.

Three may keep a secret, if two of them are dead.

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

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

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