Freedom of thought is best promoted by the gradual illumination of men's minds which follows from the advance of science.

The wars fanned the wings of science, and science brought to mankind a thousand blessings, a thousand problems and a thousand perils.

Thoroughly conscious ignorance is the prelude to every real advance in science.

The man of science is a poor philosopher.

I have just got a new theory of eternity.

I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.