"John Hart's careful unraveling of the relationship between Barth and Brunner performs two invaluable scholarly functions. It explores the reasons for their break in careful detail, and, while doing so, gives real insight into the deep theological drives and concerns of two apparently similar, but actually very different, thinkers." (Colin Gunton, King's College, London)

"Barth's 'No!' to Emil Brunner is well known, but the roots of it are little understood. It emerged from a relationship of nearly twenty years, on Brunner's side anxious for affirmation, on Barth's more and more wary. Brunner's enthusiasm for Moral Rearmament proved the last straw. Mining hitherto unpublished archive material, John Hart provides a fascinating analysis of the relationship of these two theologians, from the war years to their final break in 1934. His study throws light on the theology of the whole period." (Timothy Gorringe, University of Exeter)