Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

The pursuit of mathematics is a divine madness of the human spirit.

Error is the price we pay for progress.

I am sure that one secret of a successful teacher is that he has formulated quite clearly in his mind what the pupil has got to know in precise fashion. He will then cease from half-hearted attempts to worry his pupils with memorizing a lot of irrelevant stuff of inferior importance.

The race that does not value trained intelligence is doomed.

What we perceive as the present is the vivid fringe of memory tinged with anticipation.

After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.