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 the psychological core claim of the entire commentary: that the Aurora Consurgens is the record of an overwhelming unconscious experience whose only adequate language was alchemical symbolism.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966thesis