Origen, although he also attempted to refute the heretics chiefly by a scientific exegesis of the Holy Scriptures, exhibits an attitude which is already more akin to that of Irenaeus and Tertullian than to that of Clement. In the preface to his great work, "De principiis," he prefixed the Church doctrine as a detailed apostolic rule of faith, and in other instances also he appealed to the apostolic teaching.[62] It may be assumed that in the time of Caracalla and Heliogabalus the Alexandrian Christians had also begun to adopt the principles acted upon in Rome and other communities.[63] The Syrian Churches, or at least a part of them, followed still later.[64] There can be no doubt that, from the last decades of the third century onward, one and the same confession, identical not in its wording, but in its main features, prevailed in the great confederation of Churches extending from Spain to the Euphrates and from Egypt to beyond the Alps.[65] It was the basis of the confederation, and therefore also a passport, mark of recognition, etc., for the orthodox Christians. The interpretation of this confession was fixed in certain ground features, that is, in an Antignostic sense. But a definite theological interpretation was also more and more enforced. By the end of the third century there can no longer have been any considerable number of outlying communities where the doctrines of the pre-existence of Christ and the identity of this pre-existent One with the divine Logos were not recognised as the orthodox belief.[66] They may have first become an "apostolic confession of faith" through the Nicene Creed. But even this creed was not adopted all at once. B. _The designation of selected writings read in the churches as New Testament Scriptures or, in other words, as a collection of apostolic writings_.[67] Every word and every writing which testified of the [Greek: kurios] (Lord) was originally regarded as emanating from him, that is, from his spirit: [Greek: Hothen he kuriotes laleitai ekei Kurios estin]. (Didache IV. 1; see also 1 Cor. XII. 3). Hence the contents were holy.[68] In this sense the New Testament is a "residuary product," just as the idea of its inspiration is a remnant of a much broader view. But on the other hand, the New Testament is a new creation of the Church,[69] inasmuch as it takes its place alongside of the Old--which through it has become a complicated book for Christendom,--as a Catholic and apostolic collection of Scriptures containing and attesting the truth.