To come very near to a true theory, and to grasp its precise application, are two different things, as the history of science teaches us. Everything of importance has been said before by someone who did not discover it.

The study of mathematics is apt to commence in disappointment.

Life is the enjoyment of emotion, derived from the past and aimed at the future.

I put forward as a general definition of civilization, that a civilized society is exhibiting the five qualities of Truth, Beauty, Adventure, Art, Peace.

Other nations of different habits are not enemies: they are godsends. Men require of their neighbours something sufficiently akin to be understood, something sufficiently different to provoke attention, and something great enough to command admiration. We must not expect, however, all the virtues.

A man of science doesn't discover in order to know, he wants to know in order to discover.

Do not teach too many subjects and what you teach, teach thoroughly.