In Initiation and Spiritual Realization he adds many details on related subjects, including various inner and outer obstacles the aspirant may face, the need for attachment to a traditional exoterism, the role of the spiritual master, and a closer examination of the degrees of spiritual realization.

    An interpretation of religious philosophies and their influences with foreword by Albert Einstein.

    The original 1952 edition was banned in the USA on the grounds of obscenity, and had a restricted circulation in Australia, with a court ruling that some of the plates had to be 'blacked out' before copies could legally be sold. This edition reproduces all the material in the original, along with new introductions and additional colour plates.