The life and soul of science is its practical application, and just as the great advances in mathematics have been made through the desire of discovering the solution of problems which were of a highly practical kind in mathematical science, so in physical science many of the greatest advances that have been made from the beginning of the world to the present time have been made in the earnest desire to turn the knowledge of the properties of matter to some purpose useful to mankind.

To live among friends is the primary essential of happiness.

The atheistic idea is so nonsensical that I do not see how I can put it in words.

Vortices of pure energy can exist and, if my theories are right, can compose the bodily form of an intelligent species.

I have no satisfaction in formulas unless I feel their numerical magnitude.

In science there is only physics; all the rest is stamp collecting.

You know only insofar as you can measure.