Bardon redefines Kabbalah (or Quabbalah, as he spells it to emphasize the "Q" sound) away from the theoretical philosophy found in traditional Jewish Kabbalah or the occult speculations of the Hermetic Order of the Golden Dawn. Instead, he presents it as a strict, mathematical science of acoustics and vibration.
Franz Bardon’s The Key to the True Kabbalah (Der Schlussel zur wahren Quabbalah) is widely regarded as one of the most important texts in the modern Western esoteric canon. It is the second volume in Bardon’s celebrated trilogy, sitting between Initiation into Hermetics and The Practice of Magical Evocation . the key to the true kabbalah franz bardon pdf