Crash programs fail because they are based on theory that, with nine women pregnant, you can get a baby in a month.

I only hope that we shall not wait to adopt the program until after our astronomers have reported a new and unsuspected asteroid moving across their fields of vision with menacing speed. At that point it will be too late!

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

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 believe that the time has arrived for medical investigation of the problems of manned rocket flight, for it will not be the engineering problems but rather the limits of the human frame that will make the final decision as to whether manned space flight will eventually become a reality.

Man belongs wherever he wants to go - and he'll do plenty well when he gets there.

There are flying grandfathers. But I intend to be an orbiting grandfather.