This was the topic of my only offering to Christianity Today (2013); the issue of God’s so called transcendence and immanence, relative to the creaturely order. My article was a contribution to their Global Gospel Project, and in it I attempt to popularly introduce a rather technical conception, that in the history is known as God’s ‘power’ theology—i.e. potentia absoluta/potentia ordinata (his absolute and ordained power). This theology is often attributed to nominalist thinking, or even to William of Ockham, but no matter, what it does, whatever its historical antecedents, at a conceptual level is drive a wedge between who God is in eternity in his ‘inner-life’ (in se), and who he has revealed himself to be economically in salvation history (ad extra). Karl Barth and Thomas Torrance have pithily glossed this as their being ‘a God behind the back of Jesus’; they are quite right to do so.
I am currently reading David Congdon’s big Bultmann book (not because he and I are friends anymore, but because I should just probably read it), and in it, as he is developing the distinctions between Barth and Rudolf Bultmann, he offers a sketch (via footnote) of how Eberhard Jüngel critiques a doctoral student of Barth’s, Helmut Gollwitzer, and how Gollwitzer (as news to me) operates with the kind of dualism between God’s revealed will, and antecedent being that we see in the potentia theology we just noted. Let’s see how Congdon recounts Jüngel’s treatment of Gollwitzer, and then reflect upon what this kind of thinking might do for those of us who want to think, along with Jesus Christ, that ‘when we see him [Jesus] we see the Father.’ Congdon offers:
The fundamental criticism Jüngel levels against Gollwitzer is that he posits a bifurcation in God’s being between nature and will, between essence and existence. In other words, Gollwitzer inserts an ontological separation between “God-in-and-for-God-self” and “God-for-us,” between Deus in se and Deus pro nobis. Jüngel summarizes the issue in the following way: “Gollwitzer stresses . . . that the mode of being [Seinsart] of revelation has its ground ‘not in the essence of God but in the will of God,’ so that it is ‘not possible per analogiam to infer back’ from the understanding of God’s being-as-revelation in the mode of being [Seinsweise] of an innerhistorical subject ‘to the essence of God in the sense of God’s constitutive nature [Beschaffenheit], but only to the essence of God’s will, i.e., from God’s will as made known in history to God’s eternal will as the will of God’s free love’” (ibid., 6). Gollwitzer affirms that God ad extra reveals God ad intra, but he rejects the notion that God’s historical acts reveal God’s eternal being; instead, they only reveal God’s eternal will. Gollwitzer backs away, then, from the work of theological ontology. He does this in order to preserve God’s freedom, which Gollwitzer secures by—as Jüngel puts it—leaving “a metaphysical background in the being of God that is indifferent to God’s historical acts of revelation” (ibid.). He separates the “essence of God” from the “essence of God’s will”: the former existing as the ontological ground of the latter, though otherwise having no obvious relation to it. The constitution of God’s eternal being is, therefore, static and unaffected by the acts of God in time and space. Unfortunately, in speaking about the “essence of God’s will” Gollwitzer failed to speak correspondingly of the “will of God’s essence” (ibid.). By separating essence and will he ends up creating an abstract hidden “God behind God,” in which case there is no guarantee that the God revealed in Jesus Christ is ontologically the same God who exists from all eternity.
I wrote the following in my Christianity Today article:
If God’s revelation in Christ does not truly represent God’s eternal nature, then sending Christ could have been an arbitrary gesture. God might well have reached out to humanity in a very different manner—or not reached out to humanity at all. And at any point in the future, he might act in an infinite number of unpredictable ways. If God’s activity in revealed time doesn’t reflect his eternal nature, we cannot be sure of Jesus’ words to doubting Thomas: “If you really know me, you will know my Father as well. From now on, you do know him and have seen him” (John 14:7).
Gollwitzer presents the same dilemma that so many prior to him had. It is a similar dilemma that we get from classical Reformed and Arminian theology; one that has God mediating himself through a mechanism of absolute decrees, and through primary and secondary causation. In this scheme you can never quite be sure if you are dealing with the God revealed through his decrees, or the actual decreeing God (unless of course we want to collapse God into his decrees, but I surely don’t want to do that); similar to Gollwitzer, in this way, there is a God behind the back of Jesus for such presentations.
 David W. Congdon, The Mission of Demythologizing: Rudolf Bultmann’s Dialectical Theology (Minneapolis: Fortress Press, 2015), 15 n19. [emphasis mine]
 Bobby Grow, “God Behind the Veil: His ways are hidden from ordinary eyes, but not from the eyes of faith,” Christianity Today (May 2013): 42.