Trinity
This is a classic argument for the Deity of Christ and holds firm with anyone who honestly interprets the text.
Institutes of the Christian Religion
For if the Word were simply God, and yet possessed no other characteristic mark, John would wrongly have said that the Word was always with God [John 1:1]. When immediately after he adds that the Word was also God himself, he recalls us to the essence as a unity. But because he could not be with God without residing in the Father, hence emerges the idea of a subsistence, which, even though it has been joined with the essence by a common bond and cannot be separated from it, yet has a special mark