The theory of Baur and the Tübingen school (for so his followers came to be designated) was broadly conceived and ably advocated. In two vital respects it has had permanent influence. (1) Criticism, as already noted, has ceased to be mere debate about text and canon, and concerns itself to-day primarily with the history of Christian ideas as embodied in its primitive literature. Its problem is to relate the New Testament writings, together with all other cognate material, to the history of the developing religion from its earliest traceable form in the greater Pauline Epistles to where it emerges into the full light of day toward the close of the second century. (2) Again, Baur's outline of the process through which the nascent faith attained to full self-consciousness as a world-religion required correction rather than disproof. It was a grievous mistake to identify Peter, James, and John with those whom Paul bitterly denounces as Judaizing "false brethren," "super extra apostles," "ministers of Satan." It was a perversion of internal evidence to reject as post-Pauline the Epistles of the later period such as Philippians and Colossians, on the ground that Paul himself did not live to participate in the second crisis, the defence of his doctrine against perversion on the side of mystical, Hellenistic theosophy. The great Epistles written under the name of Paul from the period of his captivity are innocent of reference to the developed Gnostic systems of the second century. They antagonize only an incipient tendency in this direction. But while the transition of A.D. 50-150 was both deeper and more complex than Baur conceived, the transfer of the gospel during that century from Jewish to Gentile soil is really the great outstanding fact, against which as a background the literature must be read; and the initial stage of the process is marked by the controversy of Paul with the Galilean apostles. What we must call, in distinction from Paulinism, 'apostolic' Christianity is well represented in the Book of Acts. Paul's writings show that he felt himself and his churches to represent an independent type of Christianity in all respects equal to the 'apostolic,' the problem being unification of the two. Now it is axiomatic that the investigator must proceed from the relatively known and determinable to the unknown and disputable. Accordingly it is in reality from the Epistolary literature of the church, in particular the greater Pauline Epistles, that he must take his start. As a source for our understanding of the development of the life of the church the Literature of the Apostle, directly participant in the conflicts and issues of the times, even if in its later elements of doubtful or pseudonymous authorship, takes precedence as a whole over the Literature of the Catechist, with its later and more or less idealized narration, exemplified in the Book of Acts.