One of the first recorded mentions of the word “Sufism” is in connection with one Abu Hashim, who lived and taught about 753 A.D., while about a half-century later the sect sprang into prominence in Persia, Abul Said Abul Khair, Dhul Nun al Misri, and others spreading its teaching vigorously. Some of the best authorities trace it back to the very time of Mohammed himself, claiming there is historical evidence to prove that Ali, the Favorite Disciple of the Prophet, was a Sufi and really founded the sect in an inner circle of the new religion. But there are numerous legendary fragments tending to prove that the teachings of Sufism existed in the lands conquered by Mohammed long before his advent, having been taught there by wandering Vedantists from India, and which secret teachings were adopted by those of Mohammed’s followers who were mystically inclined, and who were not willing to part with their favorite philosophy in spite of their adherence to the doctrines of the new Prophet. At any rate, it may be said safely that Mohammed had no share in keeping alive the germ of mysticism, for he was opposed to it, and taught positively against it.

From Yogi Ramacharaka’s The Philosophies and Religions of India, Mumbai: Wilco Publishing House, 2005 (year of first publication not given), p. 152.