Because they're in a state of cognitive dissonance. They've tried to compartmentalize EENS away from the other modernist errors, but they do not understand that EENS-denial is at the root of the modernist errors.
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That's right, a second quote for the same post! It made me recall a certain 44-page encyclical of Pius XII (much less challenging to read BTW than
Pascendi), from which my present interest is number 27, i.e.,
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27. Some say they are not bound by the doctrine, explained in Our Encyclical Letter of a few years ago, and based on the Sources of Revelation, which teaches that the Mystical Body of Christ and the Roman Catholic Church are one and the same thing.6 Some reduce to a meaningless formula the necessity of belonging to the true Church in order to gain eternal salvation. Others finally belittle the reasonable character of the credibility of Christian faith.
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6. Cfr. Litt. Enc. Mystici Corporis Christi, A.A.S., vol. XXXV, p. 193 sq.
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That's got to be one of the most compact paragraphs of all time! While it treats of one broad topic, the Church, it refers to what must be three very different groups of people, but we have no idea whether any, most or all of them are Catholics! Perhaps they're all Protestants. Maybe they're a mix of Protestants, Jews and Orthodox. Or they could all be Moslems. Who knows? Were any of them Americans?
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He says, "Some say..." followed by "Some reduce..." and "Others finally..." Are the "
others finally" who they are, doing what they're doing, so as to warrant mention in this cryptic Letter, as a RESULT of the "some" who "reduce?" Is the last group
an effect of the second group who "reduce to a meaningless formula the necessity of belonging to the true Church?" That would explain the "finally" -- like the fans at a race track cashing in their ticket after the race is over, or stock brokers collecting their gains after the closing bell rings. Because then the third group owes its existence as a group to that cryptic "(reduction) to a meaningless formula."
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I'd like to ask a CMRI priest about that paragraph, to see if it's something they covered in seminary classes. I suspect it was.