I would be a billionaire if I was looking to be a selfish boss. That's not me.

Every epoch has its character determined by the way its population reacts to the material events which they encounter.

Disputing the commonsense notion that all events require the prior existence of some underlying matter or substance. There is no antecedent static cabinet.

Nature is probably quite indifferent to the aesthetic preferences of mathematicians.

A race preserves its vigor so long as it harbors a real contrast between what has been and what may be; and so long as it is nerved by the vigor to adventure beyond the safeties of the past. Without adventure civilization is in full decay.

It is the business of future to be dangerous.... The major advances in civilization are processes that all but wreck the societies in which they occur.

I always feel that I have two duties to perform with a parting guest: one, to see that he doesn't forget anything that is his; the other, to see that he doesn't take anything that is mine.