We should be careful here. The doctrine of the Trinity teaches that God was three persons prior to creation. That is, there has never been a “time” when all three divine persons did not exist.
I don't believe in an Eternal Trinity of Father, Son, and Spirit. However, I think all 3 Persons of the Trinity originate from eternity.
I believe that God before Creation is beyond description with the full capacity of God's Word to express God in an infinite number of ways--not just a Trinity.
If you can describe how the Son exists prior to his becoming a man without simply referencing him as God or as God's Word, I will consider that. But I don't believe you can.
My belief is that God's Son is identified as a Person distinct from the Father prior to creation only because in creation they are revealed as such. God is the eternal origin of His revelations. The Word expresses God from eternity in time in a variety of ways, including the Spirit, the Son, theophanies, and numerous revelations of God's spoken Word.
To say that God is limited to a Trinity is beyond what is said in Scriptures and is in fact contrary to the reality, in which God has revealed Himself in theophanies. The *only reason* Jesus is identified as an "Eternal Son" from eternity is because he existed as God's Word, ready to reveal God in the form of man.
Good luck showing me anything different. Usually what I get is an attempt at expressing some orthodox formula, which only wishes to present Jesus as the eternity Deity--something I fully agree with.
Jesus was "with" God in the beginning. In what way was Jesus "with" God? He was with God in the same way God's Word is with Him. God is the origin, and His Word is the expression. They are distinct because one is in eternity, before time, and the other is the eternal God being expressed in time.
How can God be expressed in eternity? From our point of view He can't, because God is infinite and beyond human expression. But we can describe the fact that He was from eternity and had with Him from eternity His Word by which to express Himself in time.
Rest assured, I know this is easily misconstrued. I do believe that all 3 Persons of the Trinity originated from eternity. In my view, all 3 are the eternal God and represent emergent revelations from God depicting His Person in a variety of ways that by definition must be distinguished from the Divine source of these revelations.
And each time an independent Personage of God is revealed, it must necessarily be distinct from another Personage of God that is revealed. See the distinction between theophanies, the Son, and the Holy Spirit, and even with the revelation of God as Father.
Each of them by necessity must be distinguished from the Father as the source of the Son and as the source of all other revealed Personages of God. Sounds like a word game, but my reason must have a basis for it--not just conformity to someone's preferred formulation of a creed.
I'm satisfied that I meet the basic requirements of creedal orthodoxy. The Trinity can only be talked about--not fully understood...by definition.
Take care....