I was reading Msgr. Clifford Fenton's article on The Local Church of Rome, and he quotes the following: Actually the infallibility of the Roman Church is much more than a mere theological opinion. The proposition that "the Church of the city of Rome can fall into error" is one of the theses of Peter de Osma, formally condemned by Pope Sixtus IV as erroneous and as containing manifest heresy.
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This condemnation is obviously highly relevant to our current situation, so I try to look it up. The footnote refers to Denzinger 730. Lo and behold, it isn't there! Denzinger doesn't have a 730 at all, but goes from 729 directly to 731. Am I going crazy or something? But then that canon is put in the footnote instead, with no explanation for why it was removed. Does anyone have any idea about this? https://archive.org/details/DenzingerTheSourcesOfCatholicDogma/page/n265/mode/2up
Yes, it was tampered with in a major way.
I forget all the in’s and outs, but apparently just after Vatican II, Karl Rahner edited the Denzinger (I think in 1965, but possibly even already before the council in 1954/5), and his great contribution was to gut the book of all its Tridentine/Baroque theology, return all the way to the teachings of the first couple centuries, and then “redevelop” that doctrine in a direction consistent with Vatican II.
Someone can correct my dates, but that’s what he did as editor of the Denzinger.
Matthew and I were taught this by Fr. Iscara as a digression in Liturgy class.