I haven’t had a chance to read all of it yet, but blogger Al Billings has made his thesis on “The nature, structure, and role of the soul in the Hermetic Order of The Golden Dawn” available for free as a PDF download.
“The Hermetic Order of the Golden Dawn was a 19 th century English society engaged in the creation of a systematic form of western esotericism. Its founders created a synthesis of previous strands of esotericism and spiritual thought that had existed in Europe. One aspect of this synthesis was the creation of a new vision of the soul. This soul went beyond a simple mixing of elements from earlier traditions and provided an integral portion of the spiritual vision that gave an overall purpose to the spiritual practices of the Golden Dawn. A discussion of the nature and structure of this soul, its key influences, and unique aspects gives clarity to some of the spiritual goals and vision of the Golden Dawn as a system of spiritual practice. This demonstrates a system of thought unique to the end of the nineteenth century that places it with other spiritual traditions of the world.”
(via In Pursuit of Mysteries)