The single thing which makes any man happiest is the realization that he has worked up to the limits of his ability, his capacity. It’s all the better, of course, if this work has made a contribution to knowledge, or toward moving the human race a little farther forward.
I think we’re going to the moon because it’s in the nature of the human being to face challenges. It’s by the nature of his deep inner soul, we’re required to do these things just as salmon swim upstream.
