Heinrich Cornelius Agrippa von Nettesheim - De occulta philosophia libri tres
De occulta philosophia libri tres (Three Books Concerning Occult Philosophy, Book 1 printed Paris 1531; Books 1-3 in Cologne 1533).
This summa of occult and magical thought, Agrippa's most important work in a number of respects, sought a solution to the skepticism proposed in De vanitate. In short, Agrippa argued for a synthetic vision of magic whereby the natural world combined with the celestial and the divine through Neoplatonic participation, such that ordinarily licit natural magic was in fact validated by a kind of demonic magic sourced ultimately from God.
By this means Agrippa proposed a magic that could resolve all epistemological problems raised by skepticism in a total validation of Christian faith.
The book was a major influence on such later magical thinkers as Giordano Bruno and John Dee, but was ill-understood after the decline of the Occult Renaissance concomitant with the Scientific Revolution.
The book (whose early draft, quite different from the final form, circulated in manuscript long before it was published) is often cited in discussions of Albrecht Dürer's famous engraving Melencolia I (1514).
(Note that Philosophy of Natural Magic: Complete Work on Natural Magic, White & Black Magic, 1569, ISBN 1-56459-160-3, is simply book 1 of De occulta philosophia libri tres.)
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