"The rise of Islam is perhaps the most amazing event in human history. Springing from a land and a people like previously negligible, Islam spread within a century over half the earth, shattering great empires, overthrowing long established religions, remolding the souls of races, and building up a whole new world - world of Islam. The closer we examine this development the more extraordinary does it appear. The other great religions won their way slowly, by painful struggle and finally triumphed with the aid of powerful monarchs who converted to the new faith. Christianity had its Constantine, Buddhism its Asoka, and Zoroastrianism its Cyrus, each lending to his chosen cult the mighty force of secular authority. Not so Islam. Arising in a desert land sparsely inhabited by a nomad race previously undistinguished in human annals, Islam sallied forth on its great adventure with the slenderest human backing and against the heaviest material odds. Yet Islam triumphed with seemingly miraculous ease, and a couple of generations saw the Fiery Crescent borne victorious from the Pyrenees to the Himalayas and from the desert of Central Asia to the deserts of Central Africa."