Franz Bardon (1909–1958) is a well-known 20th‑century occultist whose writings present systematic, practice‑oriented approaches to Western esotericism. "Key to the True Kabbalah" (original German: Der Schlüssel zur wahren Kabbala) is Bardon’s brief, dense work that reframes certain kabbalistic concepts into a practical method of working with letters, numbers, vibrations, and symbolism for spiritual development and magical technique.