Initiation, Human and Solar (1922) by Alice Bailey is a foundational esoteric text presenting initiation as a series of consciousness expansions, leading to mastery over matter and unity with the divine. Dictated through the Tibetan Master Djwhal Khul, it outlines the planetary hierarchy, the fourteen rules for discipleship, and how human evolution links to solar, cosmic, and spiritual growth. The book is considered a cornerstone of Theosophical and New Age thought, designed to help humanity move toward a collective, conscious spiritual awakening.