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218 doctrine, but that by His assistance they might inviolably keep and faithfully expound the revelation or deposit of faith delivered through the Apostles. And indeed all the venerable Fathers have embraced and the holy orthodox Doctors have venerated and followed their Apostolic doctrine; knowing most fully that this See of holy Peter remains ever free from all blemish of error according to the divine promise of the Lord our Saviour made to the Prince of His disciples: I have prayed for thee that thy faith fail not, and, when thou art converted, confirm thy brethren.

This gift, then, of truth and never-failing faith was conferred by Heaven upon Peter and his successors in this Chair, that they might perform their high office for the salvation of all; that the whole flock of Christ kept away by them from the poisonous food of error, might be nourished with the pasture of heavenly doctrine; that the occasion of schism being removed the whole Church might be kept one, and, resting on its foundation, might stand firm against the gates of hell.

But since in this very age, in which the salutary efficacy of the Apostolic office is most of all required, not a few are found who take away from its authority, we judge it altogether necessary solemnly to assert the prerogative which the only-begotten Son of God vouchsafed to join with the supreme pastoral office.

Therefore faithfully adhering to the tradition received from the beginning of the Christian faith, for the glory of God Our Saviour, the exaltation of the Catholic Religion, and the salvation of Christian people, the Sacred Council approving, We teach and define that it is a dogma divinely revealed: that the Roman Pontiff, when he speaks ex cathedrâ, that is, when in discharge of the office of Pastor and Doctor of all Christians, by virtue of his supreme Apostolic authority he defines a doctrine regarding faith or morals to be held by the Universal Church, by the divine assistance promised to him in blessed Peter, is possessed of that infallibility with which the divine Redeemer willed that His Church should be endowed for defining doctrine regarding faith or morals: and that therefore such definitions of the Roman Pontiff are irreformable of themselves, and not from the consent of the Church.