Until the discovery at Nag Hammadi in Egypt of key Manichaean (1930) and Coptic Gnostic (c.1945) papyri, knowledge of Gnosticism depended on Christian sources, notably St. Irenaeus, St. Hippolytus, Tertullian, and Clement of Alexandria. Among principal Gnostic writings are the Valentinian documents Pistis-Sophia and the Gospel of Truth (perhaps by Valentinus himself). Important too is the literature of the Mandaeans in modern Iraq, who are the only Gnostic sect extant. Gnostic elements are found in the Acts of Thomas, the Odes of Solomon, and other wisdom literature of the pseudepigrapha.
Some Gnostics taught that the world is ruled by evil archons, among them the deity of the Old Testament, who hold captive the spirit of humanity. The heavenly pleroma was the center of the divine life, and Jesus was interpreted as an intermediary eternal being, or aeon, sent from the pleroma to restore the lost knowledge of humanity's divine origin. Gnostics held secret formulas, which they believed would free them at death from the evil archons and restore them to their heavenly abode. See Valentinus for typical Gnostic teaching on the pleroma.
Gnosticism held that human beings consist of flesh, soul, and spirit (the divine spark), and that humanity is divided into classes representing each of these elements. The purely corporeal (hylic) lacked spirit and could never be saved; the Gnostics proper (pneumatic) bore knowingly the divine spark and their salvation was certain; and those, like the Christians, who stood in between (psychic), might attain a lesser salvation through faith. Such a doctrine may have inspired extreme asceticism (as in the Valentinian school) or extreme licentiousness (as in the sect of Caprocrates and the Ophites). The influence of Gnosticism on the later development of the Jewish kabbalah and heterodox Islamic sects such as the Ismailis is much debated.
See H. Jonas, Gnostic Religion (rev. ed. 1964); R. Haardt, Gnosis: Character and Testimony (1971); E. H. Pagels, The Gnostic Gospels (1979); M. W. Meyer, The Secret Teachings of Jesus (1984); B. Layton, The Gnostic Scriptures (1987); J. M. Robinson and R. Smith, The Nag Hammadi Library (1988); H.-J. Klimkeit, tr., Gnosis on the Silk Road: Gnostic Texts from Central Asia (1993).
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