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256 pages, Paperback
First published January 1, 1985
There is a special emphasis here on the link between Luther's revolutionary concept of the justice of God and his theology of the cross. McGrath sees the former as an aspect of the latter rather than as the central feature of Luther's thought.
Other themes that I found useful:
Luther learned from and retained aspects of the via moderna in which he was educated, while also reacting against it. Reading this section, I was struck by how much Luther's pre-"breakthrough" or "pre-Protestant" concept of salvation by faith alone resembles the modern evangelical concept, where a humble faith and recognition of sinful helplessness is the pre-condition (the only one) for receiving grace.
Luther used the concept of Deus absconditus ('the hidden God') in two different ways: God hidden in his revelation --supremely, on the Cross-- and God hidden behind his revelation --the God of absolute predestination. Modern Luther scholars tend to confuse the two, according to McGrath. He also believes that the second way --developed in the later controversy with Erasmus-- amounts to a betrayal of the theology of cross (2004, 167). But he doesn't develop this topic further.
For McGrath, Luther's key idea of his theologia crucis --namely, that God reveals himself through opposites (wisdom looks like foolishness, etc.)-- is "the most radical critique of the principle of analogy in theological discourse yet known" (159). At the same time, Luther brought analogy back in when he used marriage to illustrate salvation by faith alone. This was indeed a commonplace salvation analogy used by both Protestants and reform-minded Catholics (for example, it got the Archbishop of Toledo, Bartolomé Carranza, into trouble with the Spanish Inquisition). McGrath rightly points out that this analogy "far transcends any mere external or forensic imputation of righteousness" (174), a conclusion I became convinced of a few years ago while editing an early Spanish version of Luther's Freedom of the Christian.
McGrath briefly shows the powerful effect of the theology of the cross on the post-World War Two generation, citing Jurgen Moltmann's testimony: "A theology which did not speak of God in terms of the abandoned and crucified one would not have got through to us then" (180). This made me reflect on my own evangelical generation, which tends to quickly pass by the Cross to celebrate the Resurrection. We mostly have a theology of success, prosperity, and triumph; a "theology of glory", as Luther called it. We can hardly affirm with him: "Crux sola est nostra theologia".