“Either CS (coordinate system) could be used with equal justification. The two sentences: the sun is at rest and the earth moves, or the sun moves and the earth is at rest, would simply mean two different conventions concerning two different CS”

“Engineering is not only study of 45 subjects but it is moral studies of intellectual life. Make things as simple as possible..but not simpler.”

“Each makes this cosmos and its construction the pivot of his emotional life, in order to find in this way peace and security which he can not find in the narrow whirlpool of personal experience.”

“Games are the most elevated form of investigation.”

“When you sit with a nice girl for two hours, it seems like two minutes; when you sit on a hot stove for two minutes, it seems like two hours. That's relativity.”

“All life is an experiment. The more experiments you make the better.”

“All life is an experiment. Place yourself in the middle of the stream of power and wisdom which animates all whom it floats, and you are without effort impelled to truth, to right and a perfect contentment. I wish to write such rhymes as shall not suggest a restraint, but contrariwise the wildest freedom. Immortality. I notice that as soon as writers broach this question they begin to quote. I hate quotation. Tell me what you know.”

“We act not for ourselves but for the whole human race. The event of our experiment is to show whether man can be trusted with self - government.”