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“Hitherto the principle of causality was universally accepted as an indispensable postulate of scientific research, but now we are told by some physicists that it must be thrown overboard. The fact that such an extraordinary opinion should be expressed in responsible scientific quarters is widely taken to be significant of the all-round unreliability of human knowledge. This indeed is a very serious situation.”

“It may be seriously questioned whether the philosophies... which isolate mind and set it over against the world did not have their origin in the fact that the reflective or theoretical class of men elaborated a large stock of ideas which social conditions did not allow them to act upon and test. Consequently men were thrown back into their own thoughts as ends in themselves.”

“The time will come when a spacecraft carrying human beings will leave the earth and set out on a voyage to distant planets - to remote worlds. Today this may seem only an enticing fantasy, but such in fact is not the case. The launching of the first two Soviet Sputniks has already thrown a sturdy bridge from the earth into space, and the way to the stars is open”