The Key to Theosophy, Being a Clear Exposition, in the Form of Question and Answer, of the Ethics, Science, and Philosophy for the Study of Which the Theosophical Society Has Been Founded

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Helena Petrovna Blavatsky (1831–1891) was a Russian occultist and co-founder of the Theosophical Society. Her major writings, especially *Isis Unveiled* and *The Secret Doctrine*, drew together comparative religion, esotericism, and speculative cosmology, exerting a profound influence on modern esoteric and spiritual thought.