“Hold most firmly, and do not doubt at all, that not only all the pagans, but also all the Jews, and all the heretics and schismatics who end this present life outside the Catholic Church, will go into the eternal fire, ‘which was prepared for the devil and his angels’ (Mt. 25:41)” (St. Fulgentius)
Pope Innocent III (1198AD - 1216AD): “With our hearts we believe and with our lips we confess but one Church, not that of the heretics, but the Holy Roman Catholic and Apostolic Church, outside which we believe that no one is saved.” (Denzinger 423)
Pope Boniface VIII (1294AD - 1303AD) We declare, say, define, and pronounce that it is absolutely necessary for the salvation of every human creature to be subject to the Roman Pontiff (Bull Unam Sanctam).
Pope Eugene IV (1431AD - 1447AD )The most Holy Roman Church firmly believes, professes, and preaches that none of those existing outside the Catholic Church, not only pagans, but also Jews and heretics and schismatics, can have a share in life eternal; but that they will go into the eternal fire which was prepared for the devil and his angels, unless before death they are joined with Her; and that so important is the unity of this ecclesiastical body that only those remaining within this unity can profit by the sacraments of the Church unto salvation, and they alone can receive an eternal recompense for their fasts, their almsgiving, their other works of Christian piety and the duties of a Christian soldier. No one, let his almsgiving be as great as it may, no one, even if he pour out his blood for the Name of Christ, can be saved, unless he remain within the bosom and the unity of the Catholic Church (Bull Cantate Domino).
Pope Leo XII (1823AD - 1829AD): “We profess that there is no salvation outside the Church. …For the Church is the pillar and ground of the truth. With reference to those words Augustine says: `If any man be outside the Church he will be excluded from the number of sons, and will not have God for Father since he has not the Church for mother.’” (Encyclical, Ubi Primum)
Pope Gregory XVI (1831AD - 1846AD): “It is not possible to worship God truly except in Her; all who are outside Her will not be saved.” (Encyclical, Summo Jugiter)
Pope Pius IX (1846AD - 1878AD): “It must be held by faith that outside the Apostolic Roman Church, no one can be saved; that this is the only ark of salvation; that he who shall not have entered therein will perish in the flood.” (Denzinger 1647)