Dogmatic theology forms an essential part of theology in general, and therefore cannot be correctly de fined unless we have an adequate notion of the latter. Theology, then, generally speaking, is the science of faith (scientia fidei). Theology is a science. Every science deduces unknown truths from known and certain principles, by means of correct conclusions. The dogmatician receives, and believingly embraces as his principle, the infallible truths of Revela tion, and by means of logical construction, syste matic grouping, and correct deductions, erects upon this foundation a logical body of doctrine, as does the historian who works with the facts of history, or the jurist who is occupied with the statutes, or the scientist who employs bodies and their phenomena as materials for scientific con struction. Volumes V. 1 His knowability, essence and attributes. -- V. 2. The divine trinity. --V. 3. the author of nature and the supernatural. --V. 4. Christology. --V. 5. Soteriology. --V. 6. Mariology. --V. 7. Grace. --V. 8-9. The sacraments. --V. 10. The sacrament of penance. --V. 11. Extreme unction. Holy orders. Matrimony. --V. 12. Eschatology
After completing his studies at Trier, Germany, he attended the German College in Rome, as well as the Gregorianum. He received his PhD. in philosophy in 1874, his S.T.D. in 1879. He was ordained in 1878 as a priest in the Society of Jesus.
In 1889, at the request of Bishop John Keane, he joined the founding faculty of the Catholic University of America in Washington, D.C., as Professor of Apologetics.
He returned to Germany in 1894 as Professor of Dogma at Münster. He transferred to Breslau in 1897, where he continued scholarly pursuits until his death, including 24 articles for the 1913 Catholic Encyclopedia.