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

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

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

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

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

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

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

There is nothing makes a man suspect much, more than to know little.

Secrecy lies at the very core of power.