I am convinced that of all the people on the two sides of the great curtain, the space pilots are the least likely to hate each other. Like the late Erich von Holst, I believe that the tremendous and otherwise not quite explicable public interest in space flight arises from the subconscious realization that it helps to preserve peace. May it continue to do so!

Evil, by definition, is that which endangers the good, and the good is that which we perceive as a value.

All scientific knowledge to which man owes his role as master of the world arose from playful activities.

More than any other product of human scientific culture scientific knowledge is the collective property of all mankind.

I see the creative accomplishments of which highly gifted humans are capable as special cases of the universal creative process, that game played by everyone against everyone else, from which wells up all that has never been before.

In nature we find not only that which is expedient, but also everything which is not so inexpedient as to endanger the existence of the species.

Few animals display their mood via facial expressions as distinctly as cats.