Lactantius
“It is, therefore, the **Catholic Church **alone which retains true worship. This is the fountain of truth; this, the domicile of faith; this, the temple of God. Whoever does not enter there or whoever does not go out from there, he is a stranger to the hope of life and salvation. . . . Because, however, all the various groups of heretics are confident that they are the Christians and think that theirs is the
Catholic Church, let it be known that this is the true Church, in which there is confession and penance and which takes a health-promoting care of the sins and wounds to which the weak flesh is subject” (Divine Institutes 4:30:11–13 [A.D. 307]).
Augustine
“We believe also in the holy Church, that is, the
Catholic Church. For heretics violate the faith itself by a false opinion about God; schismatics, however, withdraw from fraternal love by hostile separations, although they believe the same things we do. Consequently, neither heretics nor schismatics belong to the
Catholic Church; not heretics, because the Church loves God; and not schismatics, because the Church loves neighbor” (Faith and the Creed 10:21 [A.D. 393]).
“I do not hesitate to put the
Catholic catechumen, burning with divine love, before a baptized heretic. Even within the
Catholic Church herself we put the good catechumen ahead of the wicked baptized person . . . For Cornelius, even before his baptism, was filled up with the Holy Spirit [Acts 10:44–48], while Simon [Magus], even after his baptism, was puffed up with an unclean spirit [Acts 8:13–19]” (ibid., 4:21[28]).
“Whoever is separated from this
Catholic Church, by this single sin of being separated from the unity of Christ, no matter how estimable a life he may imagine he is living, shall not have life, but the wrath of God rests upon him” (ibid., 141:5).
Fulgentius of Ruspe
“Anyone who receives the sacrament of baptism, whether in the
Catholic Church or in a heretical or schismatic one, receives the whole sacrament; but salvation, which is the strength of the sacrament, he will not have, if he has had the sacrament outside the **Catholic Church **[and remains in deliberate schism]. He must therefore return to the Church, not so that he might receive again the sacrament of baptism, which no one dare repeat in any baptized person, but so that he may receive eternal life in
Catholic society, for the obtaining of which no one is suited who, even with the sacrament of baptism, remains estranged from the
Catholic Church” (The Rule of Faith 43 [A.D. 524]).
I am amazinly shocked that you cannot see the essence. I suggest you reread carefully, because that is not what I am seeing.
catholic.com/library/Salvation_Outside_the_Church.asp