As society is now constituted, a literal adherence to the moral precepts scattered throughout the Gospels would mean sudden death.

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 misconception which has haunted philosophic literature throughout the centuries is the notion of 'independent existence.' There is no such mode of existence; every entity is to be understood in terms of the way it is interwoven with the rest of the universe.

What is morality in any given time or place? It is what the majority then and there happen to like and immorality is what they dislike.

Problems are only opportunities in disquise.

Religion will not regain its old power until it can face change in the same spirit as does science.

Religion is the last refuge of human savagery.