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Isis Unveiled: A Master-Key to the Mysteries of Ancient and Modern Science and Theology, published in 1877, is a book of esoteric philosophy and Helena Petrovna Blavatsky's first major work and a key text in her Theosophical movement.
The work was originally entitled The Veil of Isis, a title which remains on the heading of each page, but had to be renamed once Blavatsky discovered that this title had already been used for an 1861 Rosicrucian work by W.W. Reade. Isis Unveiled is divided into two volumes. Volume I, The 'Infallibility' of Modern Science, discusses Occult science and the hidden and unknown forces of nature, exploring such subjects as forces, elementals, psychic phenomena, and the Inner and Outer Man. Volume II, Theology, discusses the similarity of Christian scripture to Eastern religions such as Buddhism, Hinduism, the Vedas, and Zoroastrianism. It follows the Renaissance notion of prisca theologia, in that all these religions purportedly descend from a common source; the ancient "Wisdom-Religion". Blavatsky writes in the preface that Isis Unveiled is "a plea for the recognition of the Hermetic philosophy, the anciently universal Wisdom-Religion, as the only possible key to the Absolute in science and theology."
The work is argued by many modern scholars such as Bruce F. Campbell and Nicholas Goodrick-Clarke to be a milestone in the history of Western Esotericism. Blavatsky gathered a number of themes central to the occult tradition—perennial philosophy, a Neo-Platonic emanationist cosmology, adepts, esoteric Christianity—and reinterpreted them in relation to current developments in science and new knowledge of non-Western faiths. In doing so, Isis Unveiled reflected many contemporary controversies such as Darwin's theories on evolution and its impact on religion, and engaged in a discussion that appealed to intelligent individuals interested in religion but alienated from conventional Western forms. Blavatsky's combination of original insights, backed by scholarly and scientific sources, accomplished a major statement of modern occultism's defiance of materialist science. The work was also significant as a first statement of ideas amplified in later Theosophical writings; however, it potentially offers contradictory teachings compared to later works. For example, it is commonly argued that there is no mention of reincarnation within Isis Unveiled and the work teaches a threefold conception of man (body, soul, and spirit) in line with Neo-Platonic and Hermetic thought. This is contrasted to Blavatsky's later major works, notably The Secret Doctrine (1888), in which not only is reincarnation featured prominently, but man is conceived as having a sevenfold constitution. This shift in thought is marked by Blavatsky and the Theosophical Society's move eastward to India. However, in regard to perceived contradictions, Blavatsky maintained that beyond contradictions arising from mistakes "there is no 'discrepancy' but only incompleteness—hence, misconceptions arising from later teachings."
Detractors often accuse the book of extensive unattributed plagiarism, a view first seriously put forth by William Emmette Coleman shortly after publication and still expressed by modern scholars such as Mark Sedgwick. Indeed, Isis Unveiled makes use of a large number of sources popular among occultist at the time, often directly copying significant amounts of text. However, rather than plagiarism, scholars argue, "Blavatsky was a person who had an original set of insights but who lacked the literary skills and knowledge of English sufficient to create a work on her own. Relying on written sources and help from friends, she formulated a unique and powerful expression of occult ideas." Modern copies of Isis Unveiled are often annotated, fully delineating Blavatsky's sources and influences.
- Santucci, James A., ‘Blavatsky, Helna Petrovna’, in Dictionary of Gnosis & Western Esotericism, ed. by Wouter J. Hanegraff (Leiden & Boston: Brill, 2006), pp. 180
- Blavatsky, Helena P., Isis Unveiled: A Master-Key to the Mysteries of Ancient and Modern Science and Theology (Pasadena, CA: Theosophical University Press, 1999), vol. I. p. vii.
- Goodrick-Clarke, Nicholas, The Western Esoteric Traditions: A Historical Introduction (Oxford & New York: Oxford University Press, 2008), pp. 215-217.
- Campbell, Bruce, Ancient Wisdom Revived: A History of the Theosophical Movement (Berkeley & Los Angeles, CA: University of California Press, 1980), pp. 35-38.
- Helena Blavatsky: Western Esoteric Masters Series, ed. by Nicholas Goodrick-Clarke (Berkeley, CA: North Atlantic Books, 2004), pp.9-10.
- Blavatsky, H. P. "Theories about Reincarnation and Spirits". The Path, November, 1886.
- Sedgwick, Mark, Against the Modern World: Traditionalism and the Secret Intellectual History of the Twentieth Century (Oxford: Oxford University Press, 2004) p. 44
- Goodrick-Clarke, Nicholas, ‘The Coming of the Masters: The Evolutionary Reformulation of Spiritual Intermediaries in Modern Theosophy’, in Constructing Tradition: Means and Myths of Transmission in Western Esotericism, ed. Andreas B. Kilcher (Leiden & Boston, MA: Brill, 2010).