You can do what you will, but in any given moment of your life you can will only one definite thing and absolutely nothing other than that one thing.

Human existence is an error...it is bad today and every day it gets worse, until the worst happens.

Reason deserves to be called a prophet; for in showing us the consequence and effect of our actions in the present, does it not tell us what the future will be?

Not to go to the theater is like making one's toilet without a mirror.

Unrest is the mark of existence.

Honor means that a man is not exceptional; fame, that he is. Fame is something which must be won; honor, only something which must not be lost.

We should be surprised that a matter that generally plays such an important part in the life of man has hitherto been almost entirely disregarded by philosophers, and lies before us as raw and untreated material.