09/14/2026
Mercurius, however, is not just the medium of conjunction but also that which is to be united, since he is the essence or "seminal matter" of both man and woman. Mercurius masculinus and Mercurius foemineus are united in and through Mercurius menstrualis, which is the "aqua."
Dorn gives the "philosophical" explanation of this in his "Physica Trismegisti": In the beginning God created one world (unus mundus).
This he divided into two—heaven and earth. "Beneath this spiritual and corporeal binarius lieth hid a third thing, which is the bond of
holy matrimony.
This same is the medium enduring until now in all things, partaking of both their extremes, without which it cannot be at all, nor they without this medium be what they are, one thing out of three."
The division into two was necessary in order to bring the "one" world out of the state of potentiality into reality. Reality consists of a multiplicity of things. But one is not a number; the first number is two, and with it multiplicity and reality begin.
~Carl Jung, CW 14,
Mysterium Coniunctionis - C.G. Jung