This argument was developed particularly by Baur and Zeller and their associates in the "Tübingen School." According to Baur, the major epistles of Paul constitute the primary source of information about the apostolic age; they should therefore be interpreted without reference to any other source. When they are so interpreted, they show that the fundamental fact of apostolic history was a conflict between Paul on one side and the original apostles on the other. The conflict, Baur maintained further, is particularly plain in the Epistles to the Galatians and Corinthians, which emphasize the complete independence of Paul with reference to the pillars of the Jerusalem Church, and his continued opposition to the efforts of Jewish Christians to bring the Gentiles into subjection to the Jewish Law--efforts which must have been supported to some extent by the attitude of the original apostles. This conflict, Baur supposed further, continued up to the middle of the second century; there was a Gentile Christian party appealing to Paul and a Jewish Christian party appealing to Peter. Finally however, Baur continued, a compromise was effected; the Pauline party gave up what was really most distinctive in the Pauline doctrine of justification, while the Petrine party relinquished the demand of circumcision. The New Testament documents, according to Baur, are to be dated in accordance with the position that they assume in the conflict; those documents which take sides--which are strongly anti-Pauline or strongly anti-Petrine--are to be placed early, while those which display a tendency toward compromise are to be placed late, at the time when the conflict was being settled. Such was the "tendency-criticism" of Baur. By that criticism the Book of Acts was dated well on in the second century, because it was thought to display a tendency toward compromise--an "irenic tendency." This tendency, Baur supposed, manifested itself in the Book of Acts in a deliberate falsification of history; in order to bring about peace between the Petrine and the Pauline parties in the Church, the author of Acts attempted to show by a new account of the apostolic age that Peter and Paul really were in perfect agreement. To that end, in the Book of Acts, Paul is Petrinized, and Peter is Paulinized; the sturdy independence of Paul, which actually kept him long away from Jerusalem after his conversion, gives place, in Acts, to a desire of contact with the Jerusalem Church, which brought him early to Jerusalem and finally led him even to accept for his Gentile converts, at the "Apostolic Council," a portion of the ceremonial law. Peter, on the other hand, is represented in Acts as giving expression at the Apostolic Council to Pauline sentiments about the Law; and all through the book there is an elaborate and unhistorical parallelism between Peter and Paul.