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The Secret Book of Dzyan: Unveiling the Hidden Truth about the Oldest Manuscript in the World and Its Divine Authors (Sacred Wisdom 2)
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During the great interval of ages, this wisdom has been perpetuated in the Mystery Schools, and a few chosen disciples in each generation have been given the sacred privilege of knowing the gods. This wisdom and the power and knowledge they have gained they in turn impart to a few chosen and beloved disciples. Thus the work is carried on.
Manly Hall • What the Ancient Wisdom Expects of Its Disciples: A Study Concerning the Mystery Schools
anthroposophy
Stuart Evans • 48 cards

From the land of the Ganges many advanced occultists wandered to the land of Egypt, and sat at the feet of the Master.
Matthew Schmitz • The Kybalion (Illustrated): A Study of the Hermetic Philosophy of Ancient Egypt and Greece
The World Virgin is sometimes shown standing between two great pillars—the Jachin and Boaz of Freemasonry—symbolizing the fact that Nature attains productivity by means of polarity. As wisdom personified, Isis stands between the pillars of opposites, demonstrating that understanding is always found at the point of equilibrium and that truth is
... See moreManly P Hall • The Secret Teachings of All Ages

Because they have concealed themselves behind the so-called twelve tribes of "Israel," their denoting number is thirteen.