Mysterium Coniunctionis (Collected Works of C.G. Jung Vol.14
There are two offshoots from all the Aeons, having neither beginning nor end, from one root, and this root is a certain Power, an invisible and incomprehensible Silence. One of them appears on high and is a great power, the mind of the whole, who rules all things and is a male; the other below is a great Thought, a female giving birth to all things.
Standing opposite one another, they pair together and cause to arise in the space between them an incomprehensible Air, without beginning nor end; but in it is a Father who upholds all things and nourishes that which has beginning and end.
This is he who stood, stands, and shall stand, a masculo-feminine Power after the likeness of the pre-existing boundless Power which has neither beginning nor end, abiding in solitude. ~Carl Jung; Mysterium Coniunctionis; Page 136; Para 136. [Citing “Elenchos, VI, 19.2]