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Berthelot, " alchemy rested partly on the industrial processes of the ancient Egyptians, partly on the speculative theories of the Greek philosophers, and partly on the mystical reveries of the Gnostics and Alexandrians."
During this controversy Dionysius became convinced that the victory of mystical theology over "Jewish" chiliasm would never be secure so long as the book of Revelation passed for an apostolic writing and kept its place among the homologoumena of the canon.
Jones, Mystical Religion (1909).
For Erigena, therefore, the speculative reason is the supreme arbiter; and in accordance with its results the utterances of Scripture and of the church have not infrequently to be subjected to an allegorical or mystical interpretation.