Theosophy

[Skull]

From the Iyer's Introduction:

A.E.’s devotion to Theosophy was based upon a deep apprehension
that its central truths were not derived from any ancient or modern
sect but represented the accumulated wisdom of the ages, the
unrecorded inheritance of humanity. Its vast scheme of cosmic and
human evolution furnished him with the symbolic alphabet necessary
to interpret his recurrent visions as well as the universal
framework and metaphysical vocabulary, drawn from many mystics
and seers, which enabled him to communicate his own intuitive
perceptions. All of A.E.’s mystical writings are enriched by the
alchemical flavour of theosophical thought.