"We bear," says St. Siricius, another Pope (A.D. 385), "the burden of all who are laden; yea, rather the blessed Apostle Peter beareth them in us, who, as we trust, in all things protects and defends us the heirs of his government."[160:3] And he in turn is confirmed by St. Optatus. "You cannot deny your knowledge," says the latter to Parmenian, the Donatist, "that, in the city Rome, on Peter first hath an Episcopal See been conferred, in which Peter sat, the head of all the Apostles, . . . in which one See unity might be preserved by all, lest the other Apostles should support their respective Sees; in order that he might be at once a schismatic and a sinner, who against that one See (_singularem_) placed a second. Therefore that one See (_unicam_), which is the first of the Church's prerogatives, Peter filled first; to whom succeeded Linus; to Linus, Clement; to Clement, &c., &c. . . . to Damasus, Siricius, who at this day is associated with us (_socius_), together with whom the whole world is in accordance with us, in the one bond of communion, by the intercourse of letters of peace."[161:1] Another Pope: "Diligently and congruously do ye consult the _arcana_ of the Apostolical dignity," says St. Innocent to the Council of Milevis (A.D. 417), "the dignity of him on whom, beside those things which are without, falls the care of all the Churches; following the form of the ancient rule, which you know, as well as I, has been preserved always by the whole world."[161:2] Here the Pope appeals, as it were, to the Rule of Vincentius; while St. Augustine bears witness that he did not outstep his Prerogative, for, giving an account of this and another letter, he says, "He [the Pope] answered us as to all these matters as it was religious and becoming in the Bishop of the Apostolic See."[161:3] Another Pope: "We have especial anxiety about all persons," says St. Celestine (A.D. 425), to the Illyrian Bishops, "on whom, in the holy Apostle Peter, Christ conferred the necessity of making all men our care, when He gave him the Keys of opening and shutting." And St. Prosper, his contemporary, confirms him, when he calls Rome "the seat of Peter, which, being made to the world the head of pastoral honour, possesses by religion what it does not possess by arms;" and Vincent of Lerins, when he calls the Pope "the head of the world."[161:4] 14.