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

Once suspicion is aroused, everything feeds it.

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

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

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

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

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

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

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