Membership in the Church, as defined by Pius XII, is NOT implicit.
22. Actually only those are to be included as members of the Church who have been baptized and profess the true faith, and who have not been so unfortunate as to separate themselves from the unity of the Body, or been excluded by legitimate authority for grave faults committed. "For in one spirit" says the Apostle, "were we all baptized into one Body, whether Jews or Gentiles, whether bond or free." [17] As therefore in the true Christian community there is only one Body, one Spirit, one Lord, and one Baptism, so there can be only one faith. [18] And therefore if a man refuse to hear the Church let him be considered -- so the Lord commands -- as a heathen and a publican. [19] It follows that those are divided in faith or government cannot be living in the unity of such a Body, nor can they be living the life of its one Divine Spirit.
Outside of which no one at all will be saved. But, he doesn't say that, does he? I am still waiting for my pre-1800 source.
What error was Pius XII addressing here? Do you even know, Mr. Historian?
It was written during WWII as the h0Ɩ0cαųst was swinging into high gear. Perhaps Pius XII wanted to distance himself from nαzιsm yet appear orthodox in his beliefs.
So you don't know.
I can't read his (Pius XII's) mind. Besides, he's dead. Modernists like to pull the same "historical analysis" with Pope Boniface's Papal Bull
Unam Sanctam to explain its
ex cathedra pronouncements away.
Mystici Corpus did not, of course, contain any solemn Magisterial declarations.