When God Becomes Flat

As I've tracked and engaged the writings of the late Stanley Grenz and his theological comrade John Franke, I've tended to use them as dialogue partners primarily with respect to issues of theological methodology and epistemology. However, it's been intriguing as of late to mull over their statements on the doctrine of God. In his Theology for the Community of God, Grenz makes this assertion:

In that God is love apart from the creation of the world, love characterizes God. Love is the eternal essence of the one God. But this means that it is not merely one attribute of God among many. Rather, love is the fundamental "attribute of God." "God is love" is the foundational ontological statement we can declare concerning the divine essence. God is foundationally the mutuality of the love relationship between Father and son, and this personal love is the Holy Spirit....Because throughout eternity and apart from the world the one God is love, the God who is love cannot but respond to the world in accordance to his own eternal essence, which is love. Thus, this essential characteristic of God likewise describes the way God interacts with his world. "Love," therefore, is not only the description of the eternal God in himself, it is likewise the fundamental characteristic of God in relationship with creation (p. 72).

Love as the "fundamental" divine attribute is picked up in Franke's new book Manifold Witness: "In seeking to know the character of God in response to the action of divine self-revelation, we must seek to understand the fundamental biblical assertion that 'God is love'" (p. 56, emphasis mine). I must add that I have been reasonably optimistic about the methodological progress Franke makes in this book. He seems less insistent on buying into hard linguistic constructivism and focuses more on the notion that the truth of the gospel demands to be set forth in multiple heuristic models (hence the book's title). However, I'm wondering what to do with the thought of combining the claims that love is the fundamental divine perfection and that theological reality should be rendered polyphonically.

It seems to me that Grenz and Franke flatten out the divine essence and so pass up the opportunity to stress one vital way in which the testimony of theology should be pluriform. Those of a more classically theistic bent can say, "Yes, love is God's essence. But his righteousness, immutability, aseity, faithfulness, and so on are equally his essence. Each of the divine perfections just is God's essence considered under some aspect." However, it seems to me that Grenz and Franke lose sight of an important piece of the Christian tradition and at the same time shoot down a potentially illuminating feature of doing theology in a multiple-models manner. In short, I would like to hear more on why not only, say, the atonement but also the multi-aspectival divine nature deserves a pluriform theological witness.

I also have questions about the biblical case for the centrality of the divine attribute of love. To be sure, the apostle John teaches us that God is love, but the same teaches also that God is spirit and God is light. Why not argue that God's spirituality is his fundamental perfection? Here Grenz and Franke would probably appeal to their doctrine of the Trinity, but that is an issue for another day. Any thoughts on this?