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In 1886 Harnack was called to the University of Marburg and in 1888, in spite of violent opposition from the conservative church authorities, to Berlin. In 1890 he became a member of the Academy of Sciences. In Berlin, somewhat against his will, he was drawn into a controversy on the Apostles' Creed, in which the partisan antagonisms within the Prussian Church had found expression. Harnack's view was that the creed contains both too much and too little to be a satisfactory test for candidates for ordination; he preferred a briefer declaration of faith which could be rigorously applied to all (cf. his ''Das Apostolische Glaubensbekenntnis. Ein geschichtlicher Bericht nebst einer Einleitung und einem Nachwort'', 1892).

In 1886 Harnack was called to the University of Marburg and in 1888, in spite of violent opposition from the conservative church authorities, to Berlin. In 1890 he became a member of the Academy of Sciences. In Berlin, somewhat against his will, he was drawn into a controversy on the Apostles' Creed, in which the partisan antagonisms within the Prussian Church had found expression. Harnack's view was that the creed contains both too much and too little to be a satisfactory test for candidates for ordination; he preferred a briefer declaration of faith which could be rigorously applied to all (cf. his ''Das Apostolische Glaubensbekenntnis. Ein geschichtlicher Bericht nebst einer Einleitung und einem Nachwort'', 1892).

In Berlin, Harnack continued writing. In 1893 he published a history of early [[Christian]] [[literature]] down to Eusebius of Caesarea, ''Geschichte der altkirchlichen Literatur bis Eusebius'' (part 2 of vol. 5., 1897); and in his popular lectures, ''Das Wesen des Christentums'' appeared in 1900 (5th ed., 1901; English translation, ''What is Christianity?'' 1901). One of his later historical works, ''Die Mission und Ausbreitung des Christentums in den ersten drei Jahrhunderten'' (1902; English translation, ''The Mission and Expansion of Christianity in the First Three Centuries'', in two volumes, 1904-1905), was followed by some important [[New Testament]] studies (''Beitrage zur Einleitung in das neue Testament'', 1906 sqq.; Engl. trans.: ''Luke the Physician'', 1907; ''The Sayings of Jesus'', 1908).

In Berlin, Harnack continued writing. In 1893 he published a history of early [[Christian]] [[literature]] down to Eusebius of Caesarea, ''Geschichte der altkirchlichen Literatur bis Eusebius'' (part 2 of vol. 5., 1897); and in his popular lectures, ''Das Wesen des Christentums'' appeared in 1900 (5th ed., 1901; English translation, [http://nordan.daynal.org/wiki/index.php?title=Adolf_Harnack_and_the_Search_for_Missing_Christianity ''What is Christianity?''] 1901). One of his later historical works, ''Die Mission und Ausbreitung des Christentums in den ersten drei Jahrhunderten'' (1902; English translation, ''The Mission and Expansion of Christianity in the First Three Centuries'', in two volumes, 1904-1905), was followed by some important [[New Testament]] studies (''Beitrage zur Einleitung in das neue Testament'', 1906 sqq.; Engl. trans.: ''Luke the Physician'', 1907; ''The Sayings of Jesus'', 1908).

Harnack was one of the most prolific and stimulating of modern critical scholars, and brought up in his "Seminar" a whole generation of teachers who carried his [[ideas]] and methods throughout the whole of Germany and beyond.  

Harnack was one of the most prolific and stimulating of modern critical scholars, and brought up in his "Seminar" a whole generation of teachers who carried his [[ideas]] and methods throughout the whole of Germany and beyond.