My experiences with science led me to God. They challenge science to prove the existence of God. But must we really light a candle to see the sun?

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

Development of the space station is as inevitable as the rising of the sun; man has already poked his nose into space and he is not likely to pull it back . . . . There can be no thought of finishing, for aiming at the stars-both literally and figuratively-is the work of generations, and no matter how much progress one makes, there is always the thrill of just beginning.

Don't tell me that man doesn't belong out there. Man belongs wherever he wants to go - and he'll do plenty well when he gets there.

The best computer is a man, and it’s the only one that can be mass-produced by unskilled labor.

I find it as difficult to understand a scientist who does not acknowledge the presence of a superior rationality behind the existence of the universe as it is to comprehend a theologian who would deny the advances of science.

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