Challenge it then! With demonstration rather than assertion.
I have. You just don't recognize it, presuming automatically that "Logos" is merely titular for an individuated hypostasis of three; and not knowing the distinction between phenomenon and noumenon and the uncreated versus created of each. It's never been historically broached, which is the omission that left us with endless variants of Theology Proper.
God's eternal Logos is His literal Logos; and like Him as Spirit, is both uncreated eternal phenomenon and noumenon.
And let me say that in no way am I being adversarial or condescending. My style is often misinterpreted as such. I'm actually very touched by your obvious maturity and humility in conversation.
My point in inquiring was in part to understand if God's Logos and Pneuma would be unprocessed in the absence of creation (which you have subsequently affirmed) which I take to infer mutability.
And mistakenly so in that inference. The Logos is both eternally noumenal and phenomenal. The procession is merely ecomony by the energies of essence as action. Noumenologically, the Logos is eternally the Son.
What I'm depicting, and isn't recognized, is the precise "how" for the Son's eternal begottenness. And the same is true for the eternal (NON-Filioque) procession of the Spirit.
The Logos isn't something "in" God. It's His Logos.
was not "realized" until creation and so went from potentiality to actuality.
No. The Logos is not noumenon alone (like creation), but is uncreated phenomenon inseparable in any manner from God's Self-Conscious Self-Existence. The Logos is eternal actuality. Potentiality is pre-utterance creation as noumenon only.
So God *had* no Spirit--simply was spirit--until creation, correct?
No. God IS Spirit, means God HAS a Spirit, if it's even possible to express the distinction. God's Spirit.
The Holy Spirit is the setting apart of the uncreated eternal noumenon of Himself as Spirit from the uncreated eternal phenomenon of Himself as Spirit; and this was done by His Logos piercing and dividing asunder (merismos - which is NOT separartion, but partitioning for distribution) His Spirit out from Himself (His "Soul") as Spirit.
The Holy Spirit is not QUANTITATIVELY individuated multi-hypostatically but is QUALITATIVELY individuated multi-phenomenally.
That's more than I was looking to confirm or that I'd say but I agree it is God's nature to create or generate.
The depth, breadth, and height is important, but yes it's very simply His nature to generate, spirate, and create. Otherwise, He is not immutable.
The question was "How does created eternity lead to the conclusion there is multi-phenomenality rather than multi-hypostaticism?" and perhaps could have been phrased better: How does created eternity preclude multi-hypostaticism?
This truth comes from understanding uncreated and created phenomenon; and from the appropriate understanding of the applied definitions of Rhema and Logos.
There is no means of a multi-hypostatic God inhabiting created heaven. This takes copious expression online, when it can be illustrated fairly expediently on a white board in relatively short order.
In question form, it answers "How did an uncreated God create heaven and then occupy it?" "How does the uncreated get IN creation?"
It turns into a teaching series, and is difficult to present in this venue. Most learners are greatly assisted by visual illustration.
A second question from your explanation above: Was the Logos hypostatized at creation and, if not, what is the foundation of Christ's subsistence in the Incarnation?
If you mean "Was Christ hypostasized in flesh at creation?", no. The foundation of the Son, whether post-procession/pre-Incarnation or post-Incarnation, is the singular hypostasis that is the processed uncreated Logos as the uncreated Son in created phenomenon.
Eternally, the noumenal Logos is the Son. This is the eternal begottenness of the Son instead of just declaring it so and then declaring mystery.
Again, this is an extended teaching with illustrations and live interaction that is not translated well into words alone without volumes of expression subject to extreme caricature.
It is, after all, the revealed mystery of God's innate eternal uncreated constitution, coupled with the minutiae of ontological Christology and Pneumatology, along with Cosmogony. Not easily distilled to forum-friendly posting constraints.