Man's mind is his basic tool of survival.

Fransisco, you're some kind of very high nobility, aren't you?" He answered, "Not yet. The reason my family has lasted for such a long time is that none of us has ever been permitted to think he is born a d'Anconia. We are expected to become one.

i cannot be called upon to know a negative or to prove a negative. if there is a god and you prove it, that's fine. but you don't tell me you can't know that there isn't. i would say yes i know there isn't because i have been given no evidence.

A building has integrity, just as a man and just as seldom! It must be true to its own idea, have its own form, and serve its own purpose!

I am neither foe nor friend to my brothers, but such as each of them shall deserve of me. And to earn my love, my brothers must do more than to have been born. I do not grant my love without reason, nor to any chance passer-by who may wish to claim it. I honor men with my love. But honor is a thing to be earned.

Do not let your fire go out.

But Aristotle's philosophy was the intellect's Declaration of Independence.