So far as physics is concerned, time's arrow is a property of entropy alone.

Whether in the intellectual pursuits of science or in the mystical pursuits of the spirit, the light beckons ahead, and the purpose surging in our nature responds.

When an investigator has developed a formula which gives a complete representation of the phenomena within a certain range, he may be prone to satisfaction. Would it not be wiser if he should say 'Foiled again! I can find out no more about Nature along this line.'

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

An ocean traveler has even more vividly the impression that the ocean is made of waves than that it is made of water.

Events do not happen; they are just there, and we come across them.

Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers.