“We might have known from the first that human curiosity is undying, and that the results we announced would be enough to spear others ahead on the same age-long pursuit of the unknown.”

“Where we see the same faults followed regularly by the same misfortunes, we may reasonably think that if we could have known the first we might have avoided the others.”

“Whenever we proceed from the known into the unknown we may hope to understand, but we may have to learn at the same time a new meaning of the word 'understanding.”

“If we had known everything in this universe, we would have had to find another universe to feed our curiosity, because what keeps alive man is the curiosity!”

“As long as a thing is unknown, it belongs to us in a way that well-known things do not. For we have the opportunity to fill the empty, unknown spaces for ourselves, and in them there is room for imagination and for hope.”

“We humans have always sought to increase our personal energy in the only manner we have known, by seeking to psychologically steal it from the others--an unconscious competition that underlies all human conflict in the world.”