Martin Lings provides an excellent and authoritative introduction to the mystical movement of the Sufis based on his lifelong interest in Islamic culture. His explanation derives from a profound understanding of Sufism, and extends to many aspects which are usually neglected. His illuminating answer to 'What is Sufism?' gives a taste of the very subject matter itself. What do Sufis believe? What do they aim at? What do they do? Unlike other writers on the subject, Martin Lings treats all the three questions with equal justice. He is thus able to give a wealth of answers to the main question 'What is Sufism?', each answer being from a different angle but all going to the root of the matter. A reviewer wrote 'Should the book appear in paperback, I would use it for undergraduate and graduate courses on Islamic civilization', and in fact What is Sufism? has become a set book in colleges and universities on both sides of the Atlantic. It is now accepted as the authoritative statement on the subject of Sufism and it has been translated into French, German, Italian and Spanish. It has also been published in Sarajevo in Bosnian, and is available in Braille.

'Almost a prerequisite for any serious study of Sufism in European languages': this was the verdict of Seyyed Hossein Nasr in his review of the first edition of the book. According to the Journal of Near Eastern Studies, it is 'one of the most thorough and intimately engaging books on Sufism to be produced by a Western scholar'. Certainly there is nothing second-hand about it. The author lets Sufis speak for themselves and, in a series of unusual and absorbing texts mainly translated from Arabic, he gives a vivid picture of life in a North African Sufi order. Against this background stands the unforgettable figure of the Algerian Shaikh who was head of the order from 1909 until his death in 1934. The last few chapters are mainly devoted to his writings, which include some penetrating aphorisms, and which end with a small anthology of his remarkable mystic poems.

'To express in the language of Sufism, that is, Islamic mysticism, some of the universal truths which lie at the heart of all religions'—this is the book's avowed purpose. It came into being because the author was asked by a friend to set down in writing what he considered to be the most important things that a human being can know. He was also asked to make it very easy, and despite the depth of all that it contains, it has in fact a remarkable simplicity and clarity, due no doubt to the constant use of traditional imagery which awakens and penetrates the imagination.