A good engineer gets stale very fast if he doesn't keep his hands dirty.

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?

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

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

We should remember that science exists only because there are people, and its concepts exist only in the minds of men. Behind these concepts lies the reality which is being revealed to us, but only by the grace of God.

Everybody knows what the moon is, everybody knows what this decade is, and everybody can tell a live astronaut who returned from the moon from one who didn't

If we were to start today on an organized and well-supported space program I believe a practical passenger rocket can be built and tested within ten years.