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

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

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

Once suspicion is aroused, everything feeds it.

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

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

Nothing is hidden from the eyes of the observing world.

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.

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