It is rather remarkable to note that Dr. Jung concludes The Red Book with the words:

“The touchstone is being alone with oneself
This is the way.”

Compare this with the words with which Plotinus ends The Enneads in the Chapter entitled: “The Flight of the Alone.”

The Enneads: “F” (conclusion)

Things here are but signs that show to the wise how
the Supreme God is known; the enlightened sage
reading the sign may enter the holy place and make
the vision real. This Term, attained only by those
that have over-passed all, is the All-Transcending.
There is thus a converse in virtue of which the
essential man outgrows Being, becomes identical
with the Transcendent of Being. He that knows
himself to be one with This, has in himself
the likeness of the Supreme; if from that
heightened self he can pass higher still—
image to archetype— he has won
the term of all his journeying.