Tria et tria sunt unum. Deinde dixerunt in uno sunt tria, et spiritus, anima, et corpus sunt unum, et omnia sunt ex uno.
The alchemical Aurora Consurgens directly enunciates the formula ‘three and three are one,’ equating spirit, soul, and body as a triune unity from which all things derive, providing the primary alchemical substrate for depth-psychological readings of the Three Ones.
, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966thesis