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

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

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

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

Even a paranoid can have enemies.

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

Nothing is hidden from the eyes of the observing world.

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

I will never again command an army in America if we must carry along paid spies. I will banish myself to some foreign country first.

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

Secrecy lies at the very core of power.

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.