Isis Unveiled (1877) by Helena Blavatsky is a foundational Theosophical Society work that argues for a "Wisdom-Religion"—a unified, ancient spiritual tradition. It critiques modern science's materialism and dogmatic Christian theology, asserting that occult philosophy and Eastern wisdom hold the true keys to understanding nature, spiritual phenomena, and human immortality. Isis Unveiled serves as a pioneering, albeit controversial, synthesis of esoteric thought, calling for a return to ancient wisdom to understand the mysteries of the universe.