The secret to humor is surprise.
The secret of business is to know something that nobody else knows.
You will never do anything in this world without courage. It is the greatest quality of the mind next to honour.
In all things of nature there is something of the marvelous.
Dignity does not consist in possessing honors, but in deserving them.
We are what we repeatedly do. Excellence, then, is not an act, but a habit.
It is the mark of an educated mind to be able to entertain a thought without accepting it.