An English Translation of Juan de Torquemada's Summa de Ecclesia, Book II, Chapter 109
Chapter CIX. That the Judgments of the Apostolic See in Matters of Faith and the Salvation of Men Necessarily Cannot Err That which was said in the previous chapter has given us the clearest light of understanding that the apostolic throne has been established by divine clemency with such firmness of truth that its judgment in matters of the faith cannot possibly err from the truth. It is proper that the See which, by the supreme disposition of counsel, has been appointed as teacher of the Faith and is the hinge of all that is taught to the churches concerning those matters which are of the Faith or necessary for the salvation of souls, should be endowed by God Himself, the author of all things, whose providence cannot be wrong, with this singular gift of infallibility. As a sign of this reality, this firm name be placed first on the pontiff of that see by divine dispensation, that is, Peter, which means “rock” in the Syriac language. Thus does St. Gregory write in his 181...