We might pursue the subject farther, but we have, perhaps, said enough to convince the reader that neither race nor environment, taken by itself, can… - Arnold J. Toynbee

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We might pursue the subject farther, but we have, perhaps, said enough to convince the reader that neither race nor environment, taken by itself, can be the positive factor which, within the last six thousand years, has shaken humanity out of its static repose on the level of primitive society and started it on the hazardous quest of civilization. In any case, neither race nor environment, as hitherto envisaged, has offered, or apparently can offer, any clue as to why this great transition in human history occurred not only in particular places but at particular dates.