The universe will finally become a ball of radiation, becoming more and more rarified and passing into longer and longer wave-lengths. The longest waves of radiation are Hertzian waves of the kind used in broadcasting. About every 1500 million years this ball of radio waves will double in diameter; and it will go on expanding in geometrical progression for ever. Perhaps then I may describe the end of the physical world as-one stupendous broadcast.

In the most modern theories of physics probability seems to have replaced aether as "the nominative of the verb 'to undulate'."

It is a primitive form of thought that things exist or do not exist.

The word reality frightens me.

The idea of a universal mind or Logos would be, I think, a fairly plausible inference from the present state of scientific theory.

The pursuit of truth in science transcends national boundaries. It takes us beyond hatred and anger and fear. It is the best of us.

The quest of the absolute leads into the four-dimensional world.