Written in Latin for students at the Gregorian University in Rome, Bernard Lonergan's De Deo Tri (The Triune God) is a monumental two-part examination of trinitarian theology published initially in 1961 and again, in revised form, in 1964. The first part, the pars dogmatica, is here translated into English in an edition that includes the original Latin on facing pages. The work begins with the Prolegomena, which traces the dialectical development of trinitarian doctrine by Christian thinkers from the time of the New Testament to the Council of Nicea (AD 325). Following is a discussion of five theses outlining the evolution of the principal features of trinitarian doctrine from the New Testament through the patristic era. Along with its companion volume on systematics, The Triune God: Doctrines represents the most comprehensive treatment of trinitarian theology in recent centuries. This English translation ensures that Lonergan's masterpiece will at last be available in its entirety to contemporary readers.
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. 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. 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. 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.