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.

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

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.

Science and religion are not antagonists. On the contrary, they are sisters. While science tries to learn more about the creation, religion tries to better understand the Creator. While through science man tries to harness the forces of nature around him, through religion he tries to harness the force of nature within him.

It will free man from the remaining chains, the chains of gravity which still tie him to this planet.

With our present knowledge, we can respond to the challenge of stellar space flight solely with intellectual concepts and purely hypothetical analysis. Hardware solutions are still entirely beyond our reach and far, far away.

Basic research is what I am doing when I don't know what I am doing.