The purpose of education is not to fill a vessel but to kindle a flame.
No science can be more secure than the unconscious metaphysics which tacitly it presupposes.
A great society is a society in which its men of business think greatly of their functions.
Value is coextensive with reality.
When success turns a man's head he faces failure
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.