Whoever the author may have been, he was a man who was vouchsafed an overpowering revelation of the unconscious, which he was unable to describe in the usual ecclesiastical style but only with the help of alchemical symbols.
Von Franz establishes Aurora Consurgens as a document of authentic unconscious experience whose author was compelled to resort to alchemical symbolism because conventional theological language was inadequate to contain the psychic event.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966thesis