One in Being
...the only Son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, one in Being with the Father. Through him all things were made. Nicene-Constantinople Creed
In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things came to be through him, and without him nothing came to be. John 1:1-3
The Trinity falls into the area of "things too wonderful for me" to understand. What I do get is that God is Love and there is a logic to the assumption that in Love there must be a lover, a beloved and the love that passes between them. The Son, the Word is the beloved part of the one Love.
Obviously, as John 1 shows, Christians were clear on the "One in Being" part by the beginning of the second century AD.
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