New English Translation of St. Thomas Aquinas's Summa Theologiae (Summa Theologica)

by Alfred J. Freddoso
John and Jean Oesterle Professor Emeritus of Thomistic Studies
Professor Emeritus of Philosophy

University of Notre Dame

Dedicated to Deborah Collins-Freddoso (1949-2017)

Uxor tua sicut vitis abundans, in lateribus domus tuae

Pretiosa in conspectu Domini mors sanctorum eius


(updated August 5, 2026)
Well, after all these years, I'm within striking distance of having a complete draft of the whole Summa Theologiae. Just the seven remaining questions on the sacrament of penance stand in my way, so to speak. As always, the latest version of each question is the one available here on any given day.

Part 1 and Part 1-2 and Part 2-2 are complete, as is all of Part III up to question 83.
A slightly earlier version of the Treatise on Law (Part 1-2, questions 90-108) came out in book form in 2009 from St. Augustine's Press (click here for the Amazon site). Likewise, a slightly earlier version of The Treatise on Human Nature (Part 1, questions 75-102) came out in book form in 2010 from St. Augustine's Press (click here for the Amazon site).

Comments are welcome, no matter what their nature. At present I am especially interested in receiving corrections to the treatises in Part 2-2 from the treatise of prudence on (experts on religious life are especially invited to look at ST2-2, qq. 184-189), and corrections to all of Part 3. I have already incorporated a truly amazing number of corrections that I have received from others. I am grateful to all of you who have sent corrections, especially to a few people who have gone way beyond anything I could have dreamt of or hoped for. I always have a backlog of corrections that I will get to in good time. In fact, I will try to catch up with the comments very soon.

The rights to the publication of the translation in 'traditional' book form are held by the Aquinas Institute, under the able leadership of John and Beth Mortensen. At some time in the future they will publish my translation of the Summa, along with Beth Mortensen's translation of the Supplement, which is extracted in its entirety from Book 4 of St. Thomas's early commentary on the Sentences -- a work that Beth has, very conveniently, already translated and published in four volumes.

My main concern all along has been that the translation should remain available for free online into the indefinite future, and John has graciously agreed to host the translation on the Aquinas Institute website once I have finished it. (John claims that this helps, and does not hinder, book sales.) The translation, along with a lot of other material, can now (and into the indefinite future) also be found at my new non-Notre Dame website, freddoso.com. (My thanks to John Mortensen for helping me set up freddoso.com.)

Finally, to counter some possible misunderstandings, I use asteriks in the translation to mark words that have been taken from alternate readings in the Leonine edition of the Summa. This happens very infrequently, and my judgments are based entirely on what seems to me to make better philosophical and theological sense rather than on any putative expertise of my own with respect to manuscripts. Brackets, on the other hand, are placed around words which (a) augment clarity and (b) are reasonably thought to express what is understood in a given context, but are not quite so obvious that I feel confident enough to use the word or phrase without brackets -- a practice that I have also adopted along the way when I am indeed completely confident.

AJF - AMGD



Prima Pars (Part 1)
Pars Prima-Secundae (Part 1-2)
Pars Secunda-Secundae (Part 2-2)
Tertia Pars (Part 3)



Home