This book has six parts. There is a general introduction highlighting the a progressive understanding of the Doctrine of the Trinity retrieving the original sources of this Doctrine in the second section.In the Third section some great minds of the Church are scrutinized and the very core tenets of their understanding very well sketched out. These Theologians are: Aquinas, Bonaventure and the Reformed Fathers [Luther, Calvin].
Delineating the Doctrine from the Earliest Latin and Greek Fathers of the Church the Book also makes it clear to show the clarity of the Doctrine undeniably evident in the Earliest Christian Community in their Worship and Liturgy.
Commenting on Paul's letter to the Thessalonians Church (1:1-5)Anne Hunt affirms (Pg 365)"What is remarkable is that, even at this early stage, the community is clearly well acquainted with this Triadic pattern. No explanation is offered; evidently none is necessary. The pattern is apparently already well established as the distinctively and typically Christian way of speaking of God. This text, along with many others in the New Testament, clearly attests to the lived experience of the Three in the early Christian Community. Now, there is no question that this is Trinitarian doctrine. It would not be for some centuries that doctrine per se would be formally defined. But what is very evident , here in our earliest sources, is a distinctly triad-shaped faith, a faith that was given expression in prayer and worship. It is this lived experience of these Three that would eventually blossom in the Doctrine of the Trinity and the theological specialization that we now call Trinitarian theology, Christology, and Pneumatology."
In the fourth section the authors are grounding the Doctrine of the Trinity in tradition interpreted through the eyes of contemporary Theologians like Barth, Von Balthasar, Pannenberg, Moltmann,Rahner and the Orthodox Theologians. The authors seek to show a progressive understanding between these great thinkers all coming to the same conclusion: "the Divine attributes of God as arising out of the activity of God in the world [Pannenberg] (Pg 234)as well as "how the Bible narratives this Divine self disclosure" (Pg 129).
In the fifth section the authors try to dialogue with other religions and their basic understanding of the Trinity. They look at the Eastern perspectives of Taoism & Confucianism as well as the Trinitarian understanding supposedly evident in Hinduism, Buddhism, Judaism and Islam. The conclusion is pretty unanimous in that "they do not think of their Deities in the same way" in any way or form (Pg. 313). The authors also caution us "as with other religion, the Threefold Doctrine is best understood in its historical context, however attractive seeming cultural parallels may be" (Pg 314).
Lastly the authors try to show the systematic connections and the integration of the Trinity in our understanding of the liturgical and Spirit infused life and how that impacts Social-political strata of our daily lives.
This book is a great read and really makes me venture to read other editions and topics in the Cambridge companion series.