“The negotiations were simultaneously cerebral and physical, abstract and personal, something like a combination of chess and mountain climbing.”

“There may be more to learn by climbing the same mountain a hundred times than by climbing a hundred different mountains.”

“There are two kinds of people. Those who climb mountains and those who sit in the shadow of the mountains and critique the climbers.”

“I want to build a billion tiny factories, models of each other, which are manufacturing simultaneously… The principles of physics, as far as I can see, do not speak against the possibility of maneuvering things atom by atom. It is not an attempt to violate any laws; it is something, in principle, that can be done; but in practice, it has not been done because we are too big.”

“A god who is capable of sending intelligible signals to millions of people simultaneously, and of receiving messages from all of them simultaneously, cannot be, whatever else he might be, simple. Such Bandwidth!”

“I have found that the people who shout their opinion the loudest are usually the ones most insecure in their position.I don't think it is as much a human foible as it is a human curse that we cannot understand the beauty of a thing until it is gone.It's not that there wasn't anything to say. It's that there was too much and words were poor substitutes for our feelings.But Korczak's greatest legacy is not a public one, the massive stone mountain that he conquered, but the mountain he first conquered in himself-a mountain that he climbed alone-in this we can all empathize. (about the sculptor of Crazy Horse)”

“To become aware of what is constant in the flux of nature and life is the first step in abstract thinking. The recognition of regularity in the courses of the heavenly bodies and in the succession of seasons first provides a basis for a systematic ordering of events, and this knowledge makes possible a calendar. ... Simultaneously with this concept, a system of relationships comes into the idea of the world. Change is not something absolute, chaotic, and kaleidoscopic; its manifestation is a relative one, something connected with fixed points and a given order.”