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.

Secrets define us, they mark us, they set us apart from all the others. The secrets which we preserve provide a key to who we are, deep down.

There is nothing more deceptive than an obvious fact.

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

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

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

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

Secrecy lies at the very core of power.