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At the 1st Vatican Council on 18th July 1870, the Roman Catholic Church passed one of its most absurd doctrines, that of Papal Infallibility. The decree passed at that council stated that ‘when the Roman pontiff speaks EX CATHEDRA, that is, when, 1) in the exercise of his office as shepherd and teacher of all Christians, 2) in virtue of his supreme apostolic authority, 3) 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’a.
Although this was the first time that the infallibility of the Pope had been officially declared by the Vatican, the idea that the Pope and indeed the Roman Catholic Church could not err had long been a part of Roman Catholic church history. In 1075 Pope Gregory VII stated that ‘the Roman Church has never erred and will never err to all eternity, according to the testimony of the holy scriptures’b. Even though the doctrine of Papal Infallibility only teaches that the Pope is infallible when speaking ex cathedra, it still teaches that a mere man can infallibly define a doctrine, without rebuke from any other man. More importantly, it means that no-one can bring the teaching of that person or church to the bar of scripture to challenge whether they are true or not.