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...