It takes sixty-five thousand errors before you are qualified to make a rocket.

I believe in an immortal soul. Science has proved that nothing disintegrates into nothingness. Life and soul, therefore, cannot disintegrate into nothingness, and so are immortal.

I have learned to use the word 'impossible' with the greatest caution.

In 1492 Columbus knew less about the far Atlantic than we do about the heavens, yet he chose not to sail with a flotilla of less than three ships. . . . So it is with interplanetary exploration: it must be done on the grand scale.

To simply dismiss the concept of God as being unscientific is to violate the very objectivity of science itself.

Our sun is one of a 100 billion stars in our galaxy. Our galaxy is one of billions of galaxies populating the universe. It would be the height of presumption to think that we are the only living thing in that enormous immensity.

Get me a broom. I'll sweep my own office.