The greatest gain from space travel consists in the extension of our knowledge. In a hundred years this newly won knowledge will pay huge and unexpected dividends.

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

For me, the idea of a creation is not conceivable without invoking the necessity of design. One cannot be exposed to the law and order of the universe without concluding that there must be design and purpose behind it all.

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

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

I'm convinced that before the year 2000 is over, the first child will have been born on the moon.

Science does not have a moral dimension. It is like a knife. If you give it to a surgeon or a murderer, each will use it differently.