When thinking of the Trinity people are often thrown into a quandary, and rightly so. The reality of God is an ineffable ultimate sort of reality that becomes slippery to the inquiring mind. Many, and rightly, caution that the mysterium trinitatis is something more to be adored than parsed and ransacked for intellectual coherence. It is true that the Trinity is ultimately a mystery, but the very fact that we can even use language like ‘trinity’ indicates that there is some level of intelligibility to this grand reality. As the tradition has illumined for the inquiring hearts and minds of the church, it is possible even to develop a grammar for speaking of God’s Triune life as Father, Son, and Holy Spirit. Of course, all of these things are possible only because the impossible has been made possible by God’s choice for us in Christ to make himself known from the ontological inside out in the assumptio carnis (assumption of flesh). As such as Christians we do indeed think God as he has desired to be thought and experienced as filial Father, Son, and Holy Spirit.
John Webster as he is attempting to offer a properly ordered treatment on a doctrine of creation dogmatically grounds his development in a doctrine of God; more focused, in God’s life as Triune. As he develops his thinking he offers four hallmarks that might be said of God in his inner life as that is given as gift in extra mode in his Self-revelation. He writes at length:
God’s life in himself is the perfect, still and eternal movement in which the Father generates the Son and together with the Son breathes the Spirit. Generation and spiration the two ‘emanations’ or processions in which we may discern the personal modes of the one God are the manner in which God is limitlessly abundant life, reciprocity and ‘ineffable mutual delight’. Of these internal works, a number of things may be said, all of which are (ectypal) indications of the unfathomable depth and originality of the triune God from which there flows his presence to creatures as their maker, reconciler, and perfecter. (a) God’s ad intra works are intrinsic, their term remaining within the subject of the action (this, over against-for example-Arian ideas that the Father’s generation of the Son is a transitive act, a work like creation, terminating in an object outside God, whereas generation and creation are properly speaking entirely different kinds of divine acts. (b) God’s ad intra works are constitutive, not accidental, activities. They are not ‘voluntary’ in the sense of enacting a decision behind which there lies an agent who might have willed to act otherwise: there is no Father ‘behind’ the generation of the Son, no Father and Son ‘behind’ the breathing of the Spirit (relations of origin are eternal, not sequential). In this sense, therefore, God’s immanent activities are ‘necessary’, not by external compulsion but by absolute or natural necessity: these activities are what it is for God to be God. (c) God’s ad intra activities are unceasing, not temporal or transient. They are not an act of self-constitution or self-causation (talk of God as causa sui makes no sense); they effect no alteration or modification of the godhead; they are not productive activities which might be conceived as finished. (d) God’s ad intra activities require us to speak of distinctions between the persons of the godhead. These distinctions are various. The persons are distinguished by origin (the Son is generated by the Father, but not the Father by the Son; the Spirit proceeds from Father and Son, but not they from him); they are distinguished by the order of the relations of origin which make it possible to speak of the first, second and third persons of the Trinity (though not thereby to suggest temporal priority and posteriority or descending degrees of glory); they are, accordingly, distinguished by the order and mode of their immanent operations, which repeat the order and mode of their personal existence: the Father acts a nullo, the Son acts a Patre, the Spirit ab utroque though not, of course, at cost to the common aseity in which each person is and acts.
Important points about generation, aseity, and how the persons relate in oneness and threeness threeness and oneness (de Deo uno de Deo trino). We do see a commitment on Webster’s part to the filioque and the Western tradition, but we won’t engage with that now. More important, for my eyes, is his emphasizing of there ‘being no God behind the back of the Father or the Son or the Spirit’, a point us Torranceans and Barthians are fans of in heightened ways. We see Webster contradict the sort of post-metaphysical conception that some attribute to Barth’s theology; i.e. the idea that God’s ‘being is in becoming’, or for what Hunsinger calls the ‘revisionist Barth’ that God constitutes his being in his becoming in the incarnation (more pointedly: the resurrection). Instead Webster emphasizes the catholic view of God’s antecedent life as the ground of what is expressed and given in the outer life of the economy; we see Webster avoiding any sort of confusion between processions in the inner life with the missions given in the outer life.
These are all important points to emphasize when thinking God. Even though we have supposedly passed through a Trinitarian renaissance in Christian theology (Barth being one of its most important initiators) we might scratch our heads at the continued dereliction of thought of many, particularly within the realms of Protestant theology. We might think of someone like Bruce Ware, Wayne Grudem, or Owen Strachan and their eternal functional subordinationism or eternal submission of the Son to the Father. And now we have moved beyond, supposedly, the Trinitarian renaissance and have come to a point, according to Katherine Sonderegger et al. where God’s singularity needs to take precedence to help extinguish the relative emphasis on his multiplicity that has apparently obtained because of modern thinkers like Barth. It is interesting, really, because even Webster himself as a result of his turn to Aquinas et al. seems to want to correct the trinitarian excesses that even he had given himself over to in his early years with Barth and Jüngel. Much of Webster’s desire to correct has more to do with prolegomena or method when it comes to thinking God rather than a simple material correction in regard to a doctrine of God; when we come to that, as we have in the quote above, what we find is a Webster who is still a buddy of the ‘textual Barth’, as Hunsinger calls him.
Trinitarian theology is alive and well with many interesting trends and threads still fluttering in the minds and hearts of those who care. The Trinity matters because God matters. For the Christian there is no generic understanding of who God is; for the Christian God is necessarily Father, Son, and Holy Spirit and this reality, his persons-in-relation are the basis of his oneness, just as his oneness is the basis of his persons. When we get sidelined from the all-important reality of the Trinity, when we fail to emphasize that God is an eternal relation of love (i.e. self-giveness one for the other one in the other) precisely because he is a godhead who is personal, we end up constructing subsequent theologies that reflect whatever emphasis of God we hold dear. For an Evangelical Calvinist, as myself, understanding that God is Father by me entering that reality through the Son by the Spirit, means that the theology I do will always have a personalist and familial shape to it precisely because God in this frame just is Love.
 John Webster, God Without Measure: Working Papers In Christian Theology: Volume 1: God And The Works Of God (London: Bloomsbury T&T Clark, 2015), 89-90.