The educated man had throughout the ages found a way to covert passionate activity into silent and motionless pleasure. He can sit still in a room and not perish.

You never step in the same river of thought twice, because neither you nor it are the same.

It is not clear to anyone, least of all the practitioners, how science and technology in their headlong course do or should influence ethics and law, education and government, art and social philosophy, religion and the life of the affections. Yet science is an all-pervasive energy, for it is at once a mode of thought, a source of strong emotion, and a faith as fanatical as any in history.

In teaching you cannot see the fruit of a day's work. It is invisible and remains so, maybe for twenty years.

It is only in the shadows, when some fresh wave, truly original, truly creative, breaks upon the shore, that there will be a rediscovery of the West.

Out of man's mind in free play comes the creation Science. It renews itself, like the generations, thanks to an activity which is the best game of homo ludens: science is in the strictest and best sense a glorious entertainment.

In any assembly the simplest way to stop transacting business and split the ranks is to appeal to a principle.