"Some say they are not bound by the doctrine which teaches that the Mystical Body of Christ and the Roman Catholic Church are one and the same thing. 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. These and like errors, it is clear, have crept in among certain of our sons who are deceived by imprudent zeal for souls or by false science."

-- Pope Pius XII

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