No one demands more caution than a spy, and when someone has the skeleton key to minds, counter him by leaving the key of caution inside, on the other side of the keyhole.

Don't take the wrong side of an argument just because your opponent has taken the right side.

No' and 'Yes' are words quickly said, but they need a great amount of thought before you utter them.

There are friendships merely for pleasure, some for the exchange of ideas. Rarest are those friends of one's inmost self.

Many have had their greatness made for them by their enemies.

Hope is a great falsifier of truth.

Be first the master of yourself