In this fascinating book William G. Gray, the renowned English Kabbalist and Ceremonial Magician, delineated some of the lessons he learned from the letters which passed between himself and the Martinist, Emil Napoleon Hauenstein, his Austrian mentor and friend, whom he affectionately referred to as E.N.H., and who classified himself a mystic. Hauenstein was an Initiate of the well-known French Occultist Papus (Gerard Encausse). He addressed...