Book excerpt: "Covers the origins of Sufism and early influences, particularly from Christianity; the rise of the great Sufi organizations; the thought of Sufism's main theorist and systemizer, Ibn Arabi; Rumi and the Whirling Dervishes; relations with Shi'ism in Iran; Sufism in the heyday of the great empires in Iran, India, and Turkey; and relations with Turkey and Egypt during the nineteenth century as well as Sufi practices in the twentieth century."--Page 4 of cover.