Extra Ecclesiam Nulla Salus:
A Thread

It has been affirmed by Pope Innocent III (DS 423), The IV Lateran Council (DS 430), Pope Boniface VIII (DS 468), The Council of Florence (DS 714), Pius IX (DS 1647), Pope Clement VI (DS 5706), The Council of Trent (DS 861) etc.

Teachings from various Popes and Saints of the Church

Saint Ignatius of Antioch: "Do not deceive yourselves, he who adheres to the author of a schism will not possess the kingdom of God." [Epistle to the Philadelphians, 3 (CH 158)].

Saint Gregory the Great: "The holy universal Church teaches that God cannot be truly adored except within its fold; she affirms that all those who are separated from her will not be saved." [Moral. in Job. XIV,5 (CH 158)].

Saint John Chrysostom, Doctor, (died A.D. 407): "We know that salvation belongs to the Church alone, and that no one can partake of Christ nor be saved outside the Catholic Church and the Catholic Faith." (De Capto Eutropia)

Saint Fulgentius (died A.D. 533): "Most firmly hold and never doubt that not only pagans, but also all Jews, all heretics, and all schismatics who finish this life outside of the Catholic Church, will go into the eternal fire prepared for the devil and his angels."

Pope Saint Gregory the Great (A.D. 590-604): "Now the holy Church universal proclaims that God cannot be truly worshipped saving within herself, asserting that all they that are without her shall never be saved." (Moralia)

Saint Peter Mavimenus (died A.D. 743): "Whoever does not embrace the Catholic Christian religion will be damned, as was your false prophet Mohammed." (Roman Martyrology, February 20th) [Upon this profession of the faith, the infidel murdered him.]

Innocent III and the Fourth Ecumenical Council of the Lateran (1215 A.D.): "There is only one universal Church of the faithful, outside of which no one can be saved." [Cap. I; De fide cath.; DS 802 (CH 159)]

Saint Thomas Aquinas (died A.D. 1274): "There is no enterning into salvation outside the Church, just as in the time of the deluge there was none outside the ark, which denotes the Church." (Summa Theologiae)

Pope Eugene IV: "Whoever wishes to be saved needs, above everything else, to hold the Catholic faith. Unless each one preserves this faith whole and inviolate, he will perish in eternity without a doubt." - Exultate Deo," DZ 695

Pope Adrian II "The first requirement of salvation is to keep to the standard of the true faith." Actio I," DZ 171, n.1

Pope Gregory XVI - "He who is separated from the body of the Catholic Church, however praiseworthy his conduct may otherwise seem, will not be saved." "Perlatum Ad Nos," PTC:186; "Summo Jugiter," PTC:158

Pope Pius IV "I promise, vow, and swear that, with God's help, I shall most constantly hold and profess this true Catholic faith, outside which no one can be saved." : from the Bull "Injunctum Nobis," DZ:1000

Pope Pius VIII "Remember this firm dogma of our religion: that outside the true Catholic faith no one can be saved." - RECOLLECTIONS OF THE LAST FOUR POPES, Cardinal Nicholas Wiseman, London: 1858

Pope Pius IX "See to it that the faithful have fixed firmly in their minds this dogma of our most holy religion: the absolute necessity of the Catholic faith for attaining salvation." - Nostis et Nobiscum," December 8, 1849

Pope Pius XI "If any man does not enter the Church, or if any man departs from it, he is far from the hope of life and salvation." - Mortalium Animos," PTC:873

Pope Pius XII "No one can depart from the teaching of Catholic truth without loss of faith and salvation." - Pius XII: "Ad Apostolorum Principis," PTC:1536

Council of Trent - "Constantly hold and profess this true Catholic faith, without which no one can be saved. Tridentine Profession of Faith, DZ:1000