In The Ancient Language of Sacred Sound: The Acoustic Science of the Divine, David Elkington has put forward a truly fascinating work about the role that sound plays in our spiritual experiences.
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Cue Egyptian Magick: A Spirited Guide by Mogg Morgan, which is just the book for those who truly wish to expand their practice into a working system.
Because Kabbalah: The Tree of Life Oracle requires focus to learn, I would recommend this deck to those who are already somewhat familiar and interested in the Kabbalah.