exposition of such central doctrines as the Atonement, or the Trinity, was deprecated by early theologians, who pass by them with the remark that they are known to the initiate. This cult of secrecy engendered difficulties which are written large upon the page of history. Disputes arose about the wording of the creeds, about the canon of the Scriptures, about the number and nature of the mortal sins, and the penances which they should entail. Periodically a curious investigator raised a storm by claiming that he had discovered a flaw in the traditional formulae, or a mistake in the sense which was currently attached to them. The one way of meeting such doubts was to compare the traditions of the older churches. This could be done by a provincial synod or a general council. But of these tribunals the former was unsatisfactory, as its decisions were of merely local validity and might be overruled by the voice of the universal Church. The general council was hard to convene, particularly after a rift had opened between the Eastern and the Western Churches. It was easier to select as the final arbiter a bishop whose knowledge of tradition was derived from an apostolic predecessor. In the East there were three such sees (Antioch, Jerusalem, Alexandria), but in the West Rome alone satisfied the necessary conditions. And the Bishops of Rome could claim, with some show of reason, that their tradition was derived from a worthier source, and had been better guarded against contagion, than that of any other Apostolic Church. Was it not a well-established fact that Rome had preserved an unwavering front in the face of the heretical Arius, when even Antioch, Jerusalem, and Alexandria had wavered?