Much of this book, especially in the beginning, reads like a jargon-filled, complicated encyclopedia. Trimingham crams much information in here without successfully elaborating upon it or illustrating the points of highlights and importance. Only the patient, academic reader will come away with some real increased knowledge. If Trimingham is an expert on Sufism, he is not an expert in being concise, simple or direct. So - if you're an expert you may give this book 3 or 4 stars for its comprehensive details - but you'll have to look past the jargony, technical, and cramped style in which it is written. Those interested in a simple or concise introduction to Sufism should look elsewhere.