An explanation as to how, from ancient Qabalistic, Greek, and Egyptian roots, the Western Esoteric Systems have an unbroken initiation tradition that has been handed down from adept to neophyte. In this book, Dion Fortune indicates the broad outlines and underlying principles of these systems, illuminating an obscure and greatly misunderstood aspect of the path. Thanks to her teaching, even those who cannot give their lives to the pursuit of esoteric science can still evolve a philosophy of life and discover their individual relationship to the cosmic whole. Revised edition contains a new introduction by Gareth Knight, and an index. Dion Fortune is a celebrated teacher of the Western Mystery Tradition. She founded a study group, The Society of Inner Light, which is still active in London today. She died in 1946.