I refuse to make money out of my science. My laurel is not for sale like so many bales of cotton.

God is subtle but he is not malicious.

Truth is what stands the test of experience.

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.

America is today the hope of all honorable men who respect the rights of their fellow men and who believe in the principle of freedom and justice.

If you feed your mind as often as you feed your stomach, then you'll never have to worry about feeding your stomach or a roof over your head or clothes on your back.

If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.