church the two periods of this age are essentially distinguished from one another. While it was the church’s endeavour to adopt only the forms of culture of ancient paganism, while rejecting its godless substance, it too often happened that pagan ideas got mixed up with Christianity, and it was threatened with a similar danger from the side of Judaism. It was therefore the special task of the church during the first period to resist the encroachment of anti-Christian Jewish and Pagan elements. In the first period the perfecting of its own genuinely Christian doctrinal content was still a purely subjective matter, resting only on the personal authority of the particular church teachers. In the second period, on the other hand, the church universal, as represented by œcumenical synods with full power, proceeds to the laying down and establishing of an objective-ecclesiastical, œcumenical-catholic system of doctrine, constituting an all-sided development of the truth in opposition to the one-sided development of subjective heretical teaching. In doing so, however, the culture of the old Græco-Roman world exhausted its powers. The measure of development which these were capable of affording the church was now completed, and its future must be looked for among the new nationalities of Teutonic, Romanic, and Slavic origin. While the Byzantine empire, and with it the glory of the ancient church of the East was pressed and threatened by Islam, a new empire arose in the West in youthful vigour and became the organ of a new phase of development in the history of the church; and while the church in the West struggled after a new and higher point in her development, the Eastern church sank ever deeper down under outward oppression and inward weakness. The partition of the church into an Eastern and a Western division, which became imminent at the close of the second period, and was actually carried out during the third period, cut off the church of the East from the influence of those new vital forces, political as well as ecclesiastical, and which it might otherwise, perhaps, have shared with the West. By the overthrow of the East-Roman empire the last support of its splendour and even of its vital activity was taken away. Here too ends the history of the church on the lines of purely antique classical forms of culture. The remnants of the church of the East were no longer capable of any living historical development under the oppression of the Turkish rule. FIRST SECTION. History of the Græco-Roman Church during the Second and Third Centuries (A.D. 70-323).[18] § 20. CONTENT, DISTRIBUTION AND BOUNDARIES OF THIS PERIOD.[19]