The mysticism of letters and numbers - the true Kabbalah - is a universal teaching of great antiquity and depth. Throughout the ages, adepts have achieved the highest levels of magical attainment through the understanding of sound, colour, number and vibration as embodied in the Kabbalah. This third of Franz Bardon's remarkable texts, is nothing less than a practical guide to such attainment. Though intended as a working text for those who have completed the first two volumes (Initiation into Hermetics and The Practice of Magical Evocation), this text stands adequately on its own. Even for those without the requisite background in practical Hermetics, the reader will find it a fascinating intellectual journey through the mysticism of Tantric India, Tibet, the Hebrew Kabbalah and more.