I believe serious progress (in the abolition of war) can be achieved only when men become organized on an international scale and refuse, as a body, to enter military or war service.

Discussion and argument are essential parts of science; the greatest talent is the ability to strip a theory until the simple basic idea emerges with clarity.

What a deep faith in the rationality of the structure of the world and what a longing to understand even a small glimpse of the reason revealed in the world there must have been in Kepler and Newton to enable them to unravel the mechanism of the heavens in long years of lonely work!

To punish me for my contempt for authority, fate made me an authority myself.

We owe a lot to the Indians, who taught us how to count, without which no worthwhile scientific discovery could have been made.

Everything that is really great and inspiring is created by the individual who can labor in freedom.

If everybody lived as I do, surely the writing of romance novels would never have come into being.