In the analysis of contemporary patterns of thought, which comprises Parts II and III of this book, I have had always in mind four main problems. First, the distinguishing of the principal types of attitudes toward the doctrine of the Trinity. Second, the theological 'interest' or 'motivation' of these attitudes. . . . Third, the relation of the various restatements to 'classical' Christian views. . . . Fourth, the value and viability of the recent interpretations in terms of their relevance and meaning for contemprary religious problems and thought.
My own constructive suggestions regarding the basis and significance of the trinitarian conception, and the systematic reformulation of the doctrine, are drawn together in Part IV.
--from the Preface