Buried for more than forty years in a Latin text written for seminarians at the Gregorian University in Rome, Bernard Lonergan’s important work on systematic theology, De Deo Trino: Pars systematica, is presented here for the first time in a facing-page edition that includes the original Latin along with a precise English translation. De Deo Trino, or The Triune God, the second part of which is the pars systematica, continues a particular strand in trinitarian theology, namely, the tradition that appeals to a psychological analogy for understanding trinitarian processions and relations.

The psychological analogy dates back to St Augustine but was significantly developed by St Thomas Aquinas. Lonergan advances it to a new level of understanding by bringing to it his extensive exploration of cognitional theory and deliberative process. Suggestions for a further development of the analogy appear in Lonergan’s late work, but these cannot be fully comprehended and implemented without the background provided in this volume. With this definitive translated edition, one of the masterpieces of systematic theology, will at last be available to contemporary scholars.

Bernard Lonergan (1904-1984), a professor of theology, taught at Regis College, Harvard University, and Boston College. An established author known for his Insight and Method in Theology, Lonergan received numerous honorary doctorates, was a Companion of the Order of Canada in 1971 and was named as an original member of the International Theological Commission by Pope Paul VI.

Bernard Lonergan's profile page

Robert M. Doran is the Emmett Doerr Chair in Systematic Theology and a professor in the Department of Theology at Marquette University. He is the general editor of the Collected Works of Bernard Lonergan.

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H. Daniel Monsour is an associate editor of the Collected Works of Bernard Lonergan and holds a PhD in theology from the University of Toronto.

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Michael G. Shields is the librarian at the Lonergan Research Institute, Regis College, University of Toronto, and translator of several volumes in the Collected Works of Bernard Lonergan.

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‘The editors and translators are to be congratulated for producing editions of great value to specialists yet accessible to graduate- and divinity- level students… Those, finally, who have been intrigued or puzzled by Lonergan‘s writings on method in theology, or who have wondered what the philosophy developed in Insight might portend for theology, now have a splendid illustration of his practice.’

The Thomist, vol 75:03:2011