Manly P. Hall was an adept student (and teacher) of the great mysteries of the mind, heart, and spirit. Over the span of his 70+ year career, he published over 150 volumes of work, gave thousands of lectures (including two at Carnegie Hall), but may be best known for his work, The Secret Teaching of All Ages (1928).
"The Secret Teachings of All Ages is perhaps the most comprehensive and complete esoteric encyclopedia ever written. The sheer scope and ambition of this book are stunning. In this book Manly P. Hall has successfully distilled the essence of more arcane subjects than one would think possible. He covers Rosicrucianism and other secret societies, alchemy, cryptology, Kabbalah, Tarot, pyramids, the Zodiac, Pythagorean philosophy, Masonry, gemology, Nicholas Flammel, the identity of William Shakespeare, The Life and Teachings of Thoth Hermes Trismegistus, The Qabbalah, The Hiramic Legend, The Tree of the Sephiroth, Mystic Christianity, and there are more than 200 illustrations included here. This is essential reading for anyone wishing to explore esoteric knowledge."
The lecture below, from Hall's series on The Great Polarities, discusses the esoteric nature of the heart and mind, and how each sacred space was revered and honored within various ancient traditions.
Hall briefly elucidates on the Egyptian concept of Ma'at's feather, which is what Amenti Oracle's inspiration finds its grounding in.