If you’ve read some (or all!) of the introductory books on Aquinas, then you’ll probably already have some ideas about what you want to look at next. At this point the literature on Aquinas explodes with possibilities! You should feel free to set off in whichever direction you feel like, but I thought I’d make a few suggestions based on the directions I’ve wandered around in the past few years.
The following are excellent books, at an intermediate level, surveying Aquinas’s work. The first is theologically inclined, the second focuses more on the philosophical aspects of Aquinas.
Rik van Nieuwenhowe, Joseph Wawrykow (eds.), “The Theology of Thomas Aquinas”, University of Notre Dame Press.
Norman Kretzmann, Eleanore Stump, “The Cambridge Companion to Aquinas”, Cambridge University Press.
The following is now regarded as the “standard” biography of Aquinas. The second volume focuses on the spirituality of St Thomas; I think this latter a very important volume as it’s easy to lose sight of the spiritual when the common doctor leaves us gasping for breath with the power of his rationality. The problem is this: if you have lost sight of St. Thomas’s spirituality, you may very well have lost the plot entirely!
Jean-Pierre Torrell, “Saint Thomas Aquinas” (Volume 1, “The Person & His Work”, Volume 2, “Spiritual Master”), Catholic University of America Press.
The next suggestion may be easier to handle if you have some background knowledge of the Anglo-America tradition of analytic philosophy. A superb but lengthy book.
Eleanore Stump, “Aquinas”, Routledge.
These next two are companion volumes of collected essays. In general the quality of the essays is very good (some are quite advanced). The first looks at Aquinas’s work from the point of view of Christian doctrine, the second focuses on his scriptural commentaries (of which there are many).
Thomas Weinandy, Daniel Keating, John Yocum (eds.), “Aquinas on Doctrine”, T&T Clark.
Thomas Weinandy, Daniel Keating, John Yocum (eds.), “Aquinas on Scripture”, T&T Clark.
Questions 27-43 of the first part of the summa are devoted to God as Trinity. For a detailed consideration of these questions in the context of Aquinas’s teaching on the Trinity outside of the summa, and in the context of the teaching of other medieval theologians, perhaps the best easily available treatment is
Gilles Emery, “The Trinitarian Theology of St Thomas Aquinas”, Oxford University Press.
The second part of the summa concerns moral theology. When we eventually get to it you may wish to have a look at the following collection of essays which, between them, provide a thorough commentary on the second part. In general the essays are of very good quality with only a couple which disappoint.
Stephen Pope, “The Ethics of Aquinas”, Georgetown University Press.
The next one is a classic. I’ve never found McInerny’s books easy to read, but they’re worth the effort. This one is a brief summary of Aquinas’s ethical thought.
Ralph McInerny, “Ethica Thomistica”, Catholic University of America Press.
If you want a look at St. Thomas’s thought within the context of Catholic moral teaching then Cessario’s two books are an excellent introduction.
Romanus Cessario, “Introduction to Moral Theology”, Catholic University of America Press.
Romanus Cessario, “The Moral Virtues and Theological Ethics”, Notre Dame University Press.
Servais Pinckaers has been an important figure in the resurgence of Catholic Moral thought (especially after the encyclical “Veritatis Splendor”). He also played a key role in the writing of part 3 of the Catechism of the Catholic Church. What is attractive about his writing is the close synthesis of Thomistic moral thought with scriptural teaching. The first book is a summary and introduction to the much more substantial second.
Servais Pinckaers, “Morality: The Catholic View”, St. Augustine’s Press.
Servais Pinckaers, “The Sources of Christian Ethics”, Catholic University of America Press.
Anything Fergus Kerr writes is worth reading. This is one of my favourites.
Fergus Kerr, “After Aquinas: Versions of Thomism”, Blackwell.
Thomistic thought didn’t stop with St Thomas. Being such an attractive system, commentators and theologians developed the ideas further throughout the centuries. Cessario’s book is very short introduction to that story. It’s a straightforward read and very interesting but really makes one wish that someone would write “A Long History of Thomism”!
Romanus Cessario, “A Short History of Thomism”, Catholic University of America Press.
St Thomas wrote much more than just the summa (which you can see if you follow the links in the sidebar) and there’s still a fair amount of his oeuvre not yet translated into English. If you want a flavour of his other work, a collection of excerpts is the place to start. There are many editions of selections from his writing, but the following are good, cheap and easy to obtain.
Ralph McInerny, “Thomas Aquinas; Selected Writings”, Penguin.
Timothy McDermott, “Thomas Aquinas: Selected Philosophical Writings”, Oxford University Press.