It seems to be the first duty of a historian to investigate the causes of great revolutions; for an event which happens at any other, but its due sea… - Aloys Sprenger

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It seems to be the first duty of a historian to investigate the causes of great revolutions; for an event which happens at any other, but its due season, is a miracle : we should consider it as a wonder, if the sun should rise one second before, or after its appointed hour; or if any one were to accomplish, in his childhood, what is expected of him in his ripe age.