We teach and define as a divinely revealed dogma that when the Roman pontiff speaks ex cathedra, that is, when, in the exercise of his office as shepherd and teacher of all Christians, in virtue of his supreme apostolic authority, he defines a doctrine concerning faith or morals to be held by the whole church, he possesses, by the divine assistance promised to him in blessed Peter, that infallibility which the divine Redeemer willed his church to enjoy in defining doctrine concerning faith or morals. Therefore, such definitions of the Roman pontiff are of themselves, and not by the consent of the church, irreformable.
So then, should anyone, which God forbid, have the temerity to reject this definition of ours: let him be anathema.
First Vatican Council, Session 4, July 1870, chapter 4, “On the Infallible Teaching Authority of the Roman Pontiff”
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