A remarkable conspectus of philosophical contacts between East and West through the ages. This important monograph constitutes the whole text of Idries Shah's Seminar at Sussex University, fully annotated, indexed and with a bibliography and notes. It knits together the available knowledge about Sufi thought and literature in its passage through many deforming influences, such as the development of cults, the misinterpretation by literalist scholars, and the fallacious comparisons of committed 'specialists'.