The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

Everything of importance has been said before by somebody who did not discover it.

Vigorous societies harbor a certain extravagance of objectives, so that men wander beyond the safe provision of personal gratifications.

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 regret that it has been necessary for me in this lecture to administer a large dose of four-dimensional geometry. I do not apologize, because I am really not responsible for the fact that nature in its most fundamental aspect is four-dimensional. Things are what they are.

The point about zero is that we do not need to use it in the operation of daily life. No one goes out to buy zero fish.

Our reasonings grasp at straws for premises and float on gossamers for deductions.