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 Catholic Systematic Theology at Marquette University.Jeremy D. Wilkins is an associate professor of Systematic Theology and director of the Lonergan Research Institute at Regis College, University of Toronto. Charles C. Hefling, Jr. is a retired associate professor in the Department of Theology at Boston College.

• ENGLISH TRANSLATIONPart 1: The Teaching of the New Testament on the Hypostatic UnionPart 2: The Teaching of the Ecumenical Councils on the Hypostatic UnionPart 3: Theological Conclusions regarding the Hypostatic UnionPart 4: What Belongs Properly to Christ Appendix 1: End of § 6 in ‘Corollaries and Scholia’ in Thesis 10, 1960 EditionAppendix 2: 1960-1961 Versions of Thesis 12AbbreviationsBibliography of Modern AuthorsScriptural PassageIndexLATIN TEXTPars Prima: Doctrina NT de Unione HypostaticaPars Secunda: Conciliorum Oecumenicorum Doctrina de Unione HypostaticaPars Tertia: De Unione Hypostatica Conclusiones TheologicaePars Quarta: De Iis Quae Christi Sunt  Appendix 1: End of § 6 in ‘Corollaries and Scholia’ in Thesis 10, 1960 EditionAppendix 2: 1960-1961 Versions of Thesis 12

"Lonergan’s 1964 textbook on Christology used at the Gregorian University in Rome, is a welcome aid to those interested in Lonergan’s Christology and in the development of his theological method."- Brian Trask (Louvain Studies 40: 2017)