The ancient alchemist sought transmutation and Self- Conscious Immortality. For the soul to be immortal it must build for itself an imperishable spiritual body in which it can function after the dissolution of both the physical and astral forms. Such a spiritual body must be thought built from the high-velocity substance of the spiritual plane. Everyday thinking does not typically generate sufficient vibratory rates to accomplish this. However, with the knowledge of Spiritual Alchemy, it is possible to develop an attitude toward each event and circumstance of life which will insure, not only soul progress, but the building of an immortal vehicle. The experiences of life are symbolized by the metals of alchemy. The mystery is unlocked with the Golden Key of Astrology, and through proper mental attitude, we purify the metals, develop our character and create our destiny. In so doing, the individual progresses through the various states of higher consciousness explained in this book. The true meaning of the Philosopher`s Stone, the Elixir Vitae and the accomplishment of the Great Work are also explained. This volume is one of the 21-volume Brotherhood of Light series on the Hermetic Sciences. Written for the Brotherhood of Light by C. C. Zain, and published by its successor organization, The Church of Light, these books form the foundation for a complete course of study. They are designed to assist the aspiring individual in the quest for knowledge and the understanding of one`s physical, mental and spiritual nature.