Pius IX, 1846-1878

in which the solidarity of the Christian religion is whole and true"¹

1834. [cf. n. 171 f.]. Moreover, with the approval of the second council of Lyons, the Greeks have professed, "that the Holy Roman Church holds the highest and the full primacy and pre-eminence over the universal Catholic Church, which it truthfully and humbly professes it has received with plenitude of power from the Lord Himself in blessed Peter, the chief or head of the Apostles, of whom the Roman Pontiff is the successor; and, just as it is bound above others to defend the truth of

1835. faith, so, too, if any questions arise about faith, they should be defined by its judgment" [cf. n. 466]. Finally, the Council of Florence has defined: "That the Roman Pontiff is the true vicar of Christ and head of the whole Church and the father and teacher of all Christians; and to it in the blessed Peter has been handed down by the Lord Jesus Christ the full power of feeding, ruling, and guiding the universal Church" [see n. 694].

1836. [Argument from the assent of the Church]. To satisfy this pastoral duty, our predecessors always gave tireless attention that the saving doctrine of Christ be spread among all the peoples of the earth, and with equal care they watched that, wherever it was received, it was preserved sound and pure. Therefore, the bishops of the whole world, now individually, now gathered in Synods, following a long custom of the churches and the formula of the ancient rule, referred to this Holy See those dangers particularly which emerged in the affairs of faith, that there especially the damages to faith might be repaired where faith cannot experience a failure.² The Roman Pontiffs, moreover, according as the condition of the times and affairs advised, sometimes by calling ecumenical Councils or by examining the opinion of the Church spread throughout the world; sometimes by particular synods, sometimes by employing other helps which divine Providence supplied, have defined that those matters must be held which with God's help they have recognized as in agreement with Sacred Scripture and apostolic tradition. For, the Holy Spirit was not promised to the successors of Peter that by His revelation they might disclose new doctrine, but that by His help they might guard sacredly the revelation transmitted through the apostles and the deposit of faith, and might faithfully set it forth. Indeed, all the venerable fathers have embraced their apostolic doctrine, and the holy orthodox Doctors have venerated and followed it, knowing full well that the See of St. Peter always remains unimpaired by any error, according to the divine promise of our Lord the Savior made to the chief of His disciples: "I have prayed for thee, that thy faith fail not: and thou, being once converted, confirm thy brethren" [Luke 22:32].