I highly recommend Roger Olson and Christopher Hall’s The Trinity. This book is part of the Eerdman’s Guides to Theology series. It appears that there are only two contributions thus far to this series (this and one on feminist theology), so I can’t make any comment on the series as a whole. Regardless, this volume is a very well done and thought-provoking overview of the doctrine of the Trinity throughout the ages.
I’ve been doing a lot of reading on the Trinity lately and trying to think through how a proper understanding of this biblical truth can impact not only our understanding of God, but also our lives together as Christians. To this end, this book was very helpful insofar as it provides a concise but thorough look at how believers throughout the ages have understood this doctrine. This is historical theology at its finest. The snapshots are not so surface level as to be useless, neither are they so dense as to be cumbersome. They provide, in my opinion, just enough information to give the reader a general but good sense of where Trinitarian thought was going in various ages of the Church’s life.
To me, this would be a good introduction to any study of the Trinity. It sets the stage and helps us get a big-picture view of where we’ve been and where we’re going with the doctrine of the Trinity. That’s a view I like to have when studying a particular doctrine. It gives perspective and context. And, as none of us arose out of a vacuum, it helps us understand our own minds.
If you’d like to begin studying Trinitarian theology, this would be a great place to begin.