„The history of science—especially physics—has in part been the tension between the natural tendency to project our everyday experience on the universe and the universe’s noncompliance…“

— Carl Sagan

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„At birth all of us imagine that we are the universe, and we don't distinguish the boundaries between ourselves and those around us. …in some social situations, there is the sense that we are central, important. …there was a natural projection of those attitudes upon the universe.“
— Carl Sagan
„It is the tension between creativity and skepticism that has produced the stunning and unexpected findings of science.“
— Carl Sagan
„Natural science does not simply describe and explain nature; it is part of the interplay between nature and ourselves; it describes nature as exposed to our nature of questioning.“
— Werner Heisenberg
„Natural selection has served as a kind of intellectual sieve, producing brains and intelligences increasingly competent to deal with the laws of nature. This resonance, extracted by natural selection, between our brains and the universe may help explain a quandary set by Einstein: The most incomprehensible property of the universe, he said, is that it is so comprehensible.“
— Carl Sagan