The Church makes infallible pronouncements on doctrines of faith and morals, on their interpretation, on the Bible and Tradition, and the interpretation of any part of parts of these. The Church also pronounces on the truth or falsity of opinions, teachings, customs, etc., with relation to fundamental doctrines. Another subject on which the Church makers infallible declarations is the canonization of Saints. All whom the Church has raised to the glory of the altar by a solemn canonization are undoubtedly now in Heaven, enjoying eternal bliss in the presence of God. As the Pope has authority over the Church, he could not err in his official teaching without leading the Church into error.
Infallibility is restricted to questions regarding faith and morals.
The Church pronounces on natural sciences and on legislation only when the perversity of men makes of them instruments for opposing revealed truths. If the Pope should make judgments on mathematics or civil governments, he is as liable to error as any other man with the same experience. Letters to kings and other rulers are not infallible pronouncements. However, we should hold the Pope s opinions on any subject with great respect, on account of his position and experience. He must speak as the Vicar of Christ, in his office as Pope, and to the whole Church, to all the faithful throughout the world.