The same forces of nature which enable us to fly to the stars, enable us also to destroy our star.

What we will have attained when Neil Armstrong steps down upon the moon is a completely new step in the evolution of man.

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.

By the year 2000 we will undoubtedly have a sizable operation on the Moon, we will have achieved a manned Mars landing and it's entirely possible we will have flown with men to the outer planets.

Conquering the universe one has to solve two problems: gravity and red tape. We could have mastered gravity.

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

All one can really leave one's children is what's inside their heads. Education, in other words, and not earthly possessions, is the ultimate legacy, the only thing that cannot be taken away.