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

Once suspicion is aroused, everything feeds it.

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

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

Secrecy lies at the very core of power.

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

Nothing is hidden from the eyes of the observing world.

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

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

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

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

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

There is nothing more deceptive than an obvious fact.