When pondering the mystery of the Trinity, one might ask: Is Christ eternally pre-existent, one with God the Father from eternity past, or was He created at a moment in time?
Since we have no concept of time or sequence apart from Creation, there’s no way to describe “before” Creation, or to fathom what “eternity past” actually means, though Christ Himself declares He was there, having glory with the Father before Creation. (Jn 17:5)
So, unless we ignore the Word and propose Christ was created at or after the beginning of time and space, the question requires speculation where words are inadequate, so we might dismiss this as a foolish or unlearned question (2Ti 2:23), one which cannot be rightly articulated if Christ actually had a beginning.
Yet Christ was already God at the instant of the beginning. (Jn 1:1-2) Since all was made by Christ (Col 1:16), and nothing was created apart from Him, (Jn 1:3), Christ Himself cannot be created.
God is perfect, complete, and therefore immutable (Ja 1:17): God’s essential nature cannot change or improve. (Mal 3:6) Christ being divine yet not pre-existing along with the Father outside time and space implies a fundamental change in God’s nature when Christ arrives, proving (by contradiction) Christ has no beginning.
Christ is begotten, brought forth from the Father, revealing Him. (Mt 11:27) This does not imply Christ had a beginning any more than God the Father had a beginning. The Father has always been one with the Son, part of the same nature and being (De 6:4), having neither beginning nor end. (He 7:3)
The eternal Father ever emanates Christ; they cannot be distinguished or separated from one another (Jn 14:9), and we’re to honor them both together in the same way, as One. (Jn 5:23)