Lutheran theology affirms the eternal pre-existence of the Son of God, the second person of the Trinity. The Augsburg Confession confesses that the Son is of the same divine essence as the Father, and the Nicene Creed — explicitly received in the Book of Concord — teaches that the Son was 'begotten, not made, of one being with the Father' before all ages. John 1:1 ('In the beginning was the Word') is the foundational scriptural text.

The Formula of Concord (Article VIII) distinguishes between the eternal divine nature of the Son and the human nature assumed at the Incarnation. Luther explicitly opposed Arianism and all forms of subordinationism. The pre-existence of Christ is not merely an abstract metaphysical claim but is integral to Lutheran soteriology: it is the eternal Son of God — not a creature — who atones for human sin, which is what gives the atonement its infinite merit and efficacy.