Thanks for your latest posts, really interesting. I look forward very much to hearing more on Clarke. In the meantime, I would like to hassle you a little more on the 325-381 development that you see from homoousios to tripersonal God, as you saw on the comment I left. I even wonder if you feel you are close to identifying the semantic stepping stones (as others have attempted, but rarely in any kind of satisfying way I feel) that take take us all the way through from New Testament to Chalcedon. I sense you might be (or maybe you already have somewhere?).
The reason why I wrote this question back in March was that it had dawned on me for the first time, although this podcast and other sources had already hinted at this, that to say that "God is triune" and "the Son is homoousios [consubstantial, of the same stuff] with the Father" are not synonymous expressions. I love the fact that we can be honest and concede that we are not in a position today to fully grasp what got the church to the "tipping point" as Dale puts it. He refers to a possibility that draws from the notion of Divine Simplicity, but is unsure.
Novatian here mentions something absolutely foundational to understanding how trinitarianism might have evolved (and he is only 60 years away from the first Ecumenical Council of Nicaea). In any other religious world-view, the fact that there is more than one divine entity is not an issue, you simply add the “s” to “god”. But that is not something that the Christian faith could allow at any fundamental level – and yet the budding church had to work out some kind of solution based on their scriptures and distinctive faith. What Novatian pinpoints here is a crucial difference between other world-views of multiple gods, and the Christian God and his beloved only begotten Son – those polytheistic traditions have gods of independent origins. Jesus, however, whom the Christians worship and call “god” or "God" can do so because his origin was in the One God who has “no beginning”; he drew the logos out of himself, thus giving him the “matter” of which he is eternally and granting him divine status without multiplying the gods.