Pro-Nicene theology teaches the eternal generation of the Son because by it the son of Mary is revealed to be the very Son of God. God is a fountain of life, and the church confesses this mystery to entail that the Father begets, the Son is begotten, and the Spirit proceeds. These eternal acts, concomitant with God’s own willing nature, are temporally manifest in love and grace in the missions of the Son and Spirit. Before all ages the Father has life in himself, and grants to the Son to have life in himself (John 5:26), and in creaturely time the Son gives life to whom he will (John 5:21). The wonder of the gospel is that the eternal Son, for whom and through whom are all things, has in these last days come from the Father to the far country to bring many sons to glory (Heb 2:10).

In the fourth-century a famous debate was brewing, going back to at least Origen, and it came to a head with the Arian controversy.[1] The dispute centered on specifying the origin of Jesus Christ in the eternal life of God. Was the Son made, even if his making was prior to and unlike the other creatures (as Arius taught), or was he eternally begotten (as bishop Alexander taught)? The pathway paved through this conflict has been called pro-Nicene,[2] named from The Council of Nicaea (325). Nicaea formalized a pattern of biblical reasoning which authorized the doctrine of eternal generation as the orthodox way to speak of the Son’s perfect life.

The doctrine itself can be stated plainly: The Son is from the Father, and God has always been this way and did not become this way. We should take note that such a definition might threaten to elide the very divine ineffability it attempts to express. The patristic witness is replete with warnings here, so Gregory of Nazianzus, “The begetting of God must be honored by silence.”[3] Yet to draw back in this way is not to bring our theological reflection on God’s inner life to an end, rather it is to establish from the beginning spiritual disciplinary measures which guide how we are scripturally given to think and speak of the living God who dwells in unapproachable light (1 Tim. 6:16), comes as Light to enlighten (John 1:9), and of whom we thus confess that he is Light from Light. The doctrine of eternal generation therefore seeks, in faith and mystery, to confess that You, oh God, are “a fountain of life,” and that “in Your light we see light” (Ps 36:9).

How does eternal generation speak of this Light and Life? The doctrine’s dogmatic function in theology proper can be summarized under three themes: essential unity, personal distinction, and relational order (taxis).

Essential Unity

First, in what way does eternal generation speak of essential unity? Initially, it appears as though the confession of the Son as the only-begotten of the Father must strike against the doctrine of essential unity (divine simplicity). How can the one God be both Father and Son? The pro-Nicene answer can be seen by looking at the language of the two councils of Nicaea (325) and Constantinople (381). Both confess that the Son does not proceed from the Father as a creature from the Creator: he is begotten, not made. The Son is not part of the created order; begetting is not the first act of creation. However, neither council attempts to fully explain what it means to be begotten, respecting the ineffability of this act. Rather, they assert there is a way to be “from” that is outside all beginnings (recalling Jn. 1:1). This generation is conceived as an act internal to God[4], such that the Father generates the Son of his substance, ek tas ousias tou Patros (325), and as such the Son is consubstantial, homoousion (325 and 381), with the Father.

Two things should be noted concerning this strange language. On the one hand, the homoousion is not employed to indicate some detachable metaphysic; the language offers no objective referent on its own, instead it functions as a conceptual summary of Scripture’s affirmation of the Son’s unity with the Father grounded in his ineffable generation.[5]

On the other hand, this articulation of the Son’s generation is a denial that Begetter and Begotten are related as externally opposed realities. Instead, generation is the mode-of-sharing of the one undivided essence between Father and Son. As such, generation is conceived as a communication of the whole undivided essence, as Athanasius interprets with the language of “whole participation.”[6] The Nicene Creed (381) adds the corresponding clause that the Son is, “begotten of the Father before all ages”, specifying the timeless and eternal nature of the Son’s generation. Dogmatically, begetting is a mode of divine unity, an affirmation of essential unity rather than a denial of it.[7]

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