The idea of man leaving this earth and flying to another celestial body and
landing there and stepping out and walking over that body has a fascination
and a driving force that can get the country to a level of energy, ambition,
and will that I do not see in any other undertaking. I think if we are
honest with ourselves, we must admit that we needed that impetus extremely
strongly. I sincerely believe that the space program, with its manned
landing on the moon, if wisely executed, will become the spearhead for a
broad front of courageous and energetic activities in all the fields of
endeavour of the human mind - activities which could not be carried out
except in a mental climate of ambition and confidence which such a spearhead
can give.
-- Dr. Martin Schwarzschild, 1962, in "The History of Manned Space
Flight"