Planning a good society as far ahead as one can see, does not mean that our adventures have ended; they have just begun. Human nature is growing up. As we put behind us the accidents and tears of childhood squabbles and the wooden swords and shields, and begin to try on our new space pilots' uniform, so to speak, we begin to see what we can teach ourselves and what we can really become with new self-control over new adult powers.
Cited in: Bernhard Joseph Stern ed. Science and Society. p. 135 - The step to man, 1966