Once suspicion is aroused, everything feeds it.

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

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

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

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

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

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

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

The first duty of a good inquisitor is to suspect especially those who seem sincere to him.