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

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.

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

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

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

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

Once suspicion is aroused, everything feeds it.

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

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

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

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

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

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