The newspapers at one time said that I was dead but after carefully examining the evidence I came to the conclusion that this statement was false.

The human race may well become extinct before the end of the century. Speaking as a mathematician, I should say the odds are about three to one against survival.

More important than the curriculum is the question of the methods of teaching and the spirit in which the teaching is given

We are all prone to the malady of the introvert who with the manifold spectacle of the world spread out before him, turns away and gazes only upon the emptiness within.

To modern educated people, it seems obvious that matters of fact are to be ascertained by observation, not by consulting ancient authorities. But this is an entirely modern conception, which hardly existed before the seventeenth century.

Nothing is so exhausting as indecision, and nothing is so futile.

The good life is one inspired by love and guided by knowledge.