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The doctrine of papal infallibility was formally accepted at the First Vatican Council in 1870. This is not to say that it did not exist previously to that date: only that 1870 is when it became dogma - a teaching which all Catholics are required to believe. Exercises of infallibility are more difficult to identify when occurring prior to 1870. There have ...

You can simply read Vatican I. Its extremely clear. A true Pope (not an antipope or heretic claiming to be the Pope), when speaking on a matter of faith or morals (not economics or science) when speaking to the universal Church (not a letter to a friend) is guided by the Holy Spirit. when the Roman pontiff speaks EX CATHEDRA, that is, when, ...

Yeah, you want: from TAN Books. It's got a pretty well sourced index. Mark Trapp speaks truth about the Marian Dogmas, there are four of 'em but only the last two are the products of papal statements, the other two were pronounced as result of ecumenical councils. But, Bl. John Paul II spoke on an infallible teaching about women in the priesthood, ...

Papal infallibility means that under certain conditions the Roman Pontiff (the Pope) cannot err when teaching about faith or morals. This is called speaking ex cathedra and its conditions include: The Pope must speak as the pastor and teacher of all Christians (cum omnium Christianorun pastoris et doctoris munere fungens). The teaching must define a ...