Just at the end of this time, on the point of being thrown into prison, whence he only emerged to martyrdom, Paul was at Rome with Peter, and he describes in imperishable words the work which had been already accomplished. Again it is not only dogma but history, not only that which was always to be but that which already was, which he set forth as it were with his dying voice: the one Body, and the one Spirit, the one Lord, one Faith, and one Baptism, as there is one God. That Body in which Apostles, Prophets, Evangelists, Pastors and Teachers were fixed, that the visible structure might grow up to its final stature, in whose accordant unity was the perpetual safeguard against error. When Paul so wrote,(294) the Body was formed, and its headship was incontestably with Peter. He had no need to remind them of the man with whom he was labouring, of whose work the whole Church from Rome to Antioch and Alexandria was the fruit. But he places the maintenance of truth, and the perpetual fountain of grace, in the unity of the Church, which was before those to whom he wrote an accomplished fact. Two generations pass and the aged S. Ignatius, on his way to martyrdom, attests the same fact. “Where is Jesus Christ,” he says, “there is the Catholic Church.” The King is in His Kingdom; the Master in His House; the Lord in His Temple. The bishops throughout the world inseparably linked together are His mind: and the presidency of charity, which is the inner life of all this spiritual empire, is at Rome. S. Ignatius and the author of the letter to Diognetus write just after the expiration of the apostolic period; and they both regard Christians as one mass throughout the world, living under a divine form of spiritual government. No one who studies their words can doubt that the one Body and the one Spirit were as visible to their eyes and as dear to their heart as to S. Paul. We pass two generations further and S. Irenæus repeats the same testimony. The interval has been filled by incessant attacks of heresies, and the Bishop of Lyons dwells upon the fact that the Church speaks with one voice through all the regions of the earth as being one House of God, and that the seat of this its unity is in the great See founded by the Princes of the Apostles at Rome. He reproduces at great length the statements of S. Paul that the safeguard of truth lies in the one apostolic ministry, for which he runs up to the fountain-head in Rome. It is in the living voice and the teaching office of the Church that he sees a perpetual preservative against whatever error may arise. Thus it has been up to his time, and thus it will ever be.