This book, written by subject expert Dr. Martin Lings, is a very comprehensive introduction to Sufism, from both historical and practical viewpoints. Dr. Lings’ observations were written at a time prior to his own conversion to Islam, and conveys Sufism as an integral part of the Muslim faith, if not essential. Not meant for light reading, this book delves into the esoteric concepts of Sufism and Islam. It is a great introductory book for non-Muslims to gain an understanding of Islam as a way of life and a means to achieve spiritual bliss; this book is far from the usual depiction of Islam as a religion of rules and regulations. Though not essentially a book focused on health and healing, an understanding of the concepts of Sufism will aid you in your understanding of Islam, Sufism, and the general medical and health practices of the Sufis and Muslims in general.