The Athanasian Creed – One of the symbols of the Faith approved by the Church and given a place in her liturgy.
IV Lateran Council 1215: “One indeed is the universal Church of the Faithful, outside of which no one at all is saved.” Pope Innocent III ex Cathedra. http://www.fordham.edu/halsall/basis/lateran4.html
I do, at this present, freely profess and truly hold this true Catholic faith, without which no one can be saved; and I promise most constantly to retain and confess the same entire and inviolate, with God's assistance, to the end of my life. http://www.uoregon.edu/~sshoemak/323/texts/trent.htm
- John 10:14-16 I am the good shepherd: and I know mine, and mine know me. As the Father knoweth me, and I know the Father: and I lay down my life for the sheep. And other sheep [Gentiles] I have that are not of this fold [Jews]: them also I must bring. And they shall hear my voice: And there shall be one fold and one shepherd.
- John 21:17 He said to him the third time: Simon, son of John, lovest thou me? ... And he said to him: Lord, thou knowest all things: thou knowest that I love thee. He said to him: Feed my sheep.
- Matthew 16:18-19 And I say to thee: That thou art Peter [Kepha]; and upon this rock [kepha] I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose on earth, it shall be loosed also in heaven.
- Ephesians 4:3-5 Careful to keep the unity of the Spirit in the bond of peace. One body and one Spirit: as you are called in one hope of your calling. One Lord, one faith, one baptism.
- Song of Solomon 6:9 One is my dove, my perfect one is but one, she is the only one
If anyone, however, either suggests or believes or presumes to teach contrary to this faith, let him know that he is condemned and also anathematized according to the opinion of the same Fathers. . . . Consider (therefore) the fact that whoever has not been in the peace and unity of the Church, cannot have the Lord [Gal. 3:7]. . . . Those who were not willing to be at agreement in the Church of God, cannot remain with God; although given over to flames and fires, they burn, or thrown to wild beasts, they lay down their lives, there will not be [for them] that crown of faith, but the punishment of faithlessness, not a glorious result (of religious virtue), but the ruin of despair. Such a one can be slain, he cannot be crowned. … If slain outside of the Church, he cannot attain to the rewards of the Church (Denzinger 246-247). http://onetruecatholicfaith.com/ http://www.catecheticsonline.com/
Pope Innocent III. Profession of Faith Prescribed for Durand of Osca and His Waldensian Companions* [From the letter "Fitts exemplo" to the Archbishop of Terraco, Dec. 18, 1208]:
By the heart we believe and by the mouth we confess the one Church, not of heretics but the Holy Roman, Catholic, and Apostolic (Church) outside which we believe that no one is saved. (Denzinger 423). http://onetruecatholicfaith.com/ http://www.catecheticsonline.com/
Pope Boniface VIII. Unam Sanctam – 18 November 1302
Urged by faith, we are obliged to believe and to maintain that the Church is one, holy, catholic, and also apostolic. We believe in her firmly and we confess with simplicity that outside of her there is neither salvation nor the remission of sins, as the Spouse in the Canticles [Sgs 6:8] proclaims: 'One is my dove, my perfect one. She is the only one, the chosen of her who bore her,' and she represents one sole mystical body whose Head is Christ and the head of Christ is God [1 Cor 11:3]. In her then is one Lord, one faith, one baptism [Eph 4:5]. There had been at the time of the deluge only one ark of Noah, prefiguring the one Church, which ark, having been finished to a single cubit, had only one pilot and guide, i.e., Noah, and we read that, outside of this ark, all that subsisted on the earth was destroyed. http://www.papalencyclicals.net/Bon08/B8unam.htm
Pope Benedict XIV. (1740-1758), Nuper ad nos, March 16. 1743:
Likewise, all other things I accept and profess, which the Holy Roman Church accepts and professes, and I likewise condemn, reject, and anathematize, at the same time all contrary things, both schisms and heresies, which have been condemned, rejected, and anathematized by the same Church. In addition, I promise and swear true obedience to the Roman Pontiff, the successor of Blessed Peter, the prince of the Apostles and the vicar of Jesus Christ. And that this faith of the Catholic Church, without which no one can be saved, etc. . . . [as in the Tridentine profession of faith, see n. 1000 ]. (Denzinger 473). http://onetruecatholicfaith.com/Roman-Catholic-Dogma.php http://www.catecheticsonline.com/SourcesofDogma15.php
Pope St Pius X. Traditi Humilitati, May 24, 1829:
Against these experienced sophists the people must be taught that the profession of the Catholic faith is uniquely true, as the apostle proclaims: one Lord, one faith, one baptism. Jerome used to say it this way: he who eats the lamb outside this house will perish as did those during the flood who were not with Noah in the ark.
Furthermore, the Bibles are rarely without perverse little inserts to insure that the reader imbibes their lethal poison instead of the saving water of salvation. Long ago the Apostolic See warned about this serious hazard to the faith and drew up a list of the authors of these pernicious notions. ... With these arms may you too strive to fight the battles of the Lord which endanger the sacred teachings, lest this deadly virus spread in your flock.
The heretics have disseminated pestilential books everywhere, by which the teachings of the impious spread, much as a cancer. To counteract this most deadly pest, spare no labor.
Pope Leo XII encyclical Ubi Primum, 1823-1829:
14. Certainly many remarkable authors, adherents of the true philosophy, have taken pains to attack and crush this strange view. But the matter is so self-evident that it is superfluous to give additional arguments. It is impossible for the most true God, who is Truth Itself, the best, the wisest Provider, and the Rewarder of good men, to approve all sects who profess false teachings which are often inconsistent with one another and contradictory, and to confer eternal rewards on their members. For we have a surer word of the prophet, and in writing to you We speak wisdom among the perfect; not the wisdom of this world but the wisdom of God in a mystery. By it we are taught, and by divine faith we hold one Lord, one faith, one baptism, and that no other name under heaven is given to men except the name of Jesus Christ of Nazareth in which we must be saved. This is why we profess that there is no salvation outside the Church.
 He who hears you, hears me; and he who despises you, despises me; and the Church is the pillar and firmament of truth, as the apostle Paul teaches. In reference to these words St. Augustine says: "Whoever is without the Church will not be reckoned among the sons, and whoever does not want to have the Church as mother will not have God as father." http://www.papalencyclicals.net/Leo12/l12ubipr.htm
The following teachings were solemnly condemned by Pope Pius IX as heresies in the Syllabus of Errors: III. INDIFFERENTISM, LATITUDINARIANISM
HERESY #15. Every man is free to embrace and profess that religion which, guided by the light of reason, he shall consider true. -- Allocution "Maxima quidem," June 9, 1862; Damnatio "Multiplices inter," June 10, 1851.
HERESY #16. Man may, in the observance of any religion whatever, find the way of eternal salvation, and arrive at eternal salvation. -- Encyclical "Qui pluribus," Nov. 9, 1846. HERESY
HERESY #17. Good hope at least is to be entertained of the eternal salvation of all those who are not at all in the true Church of Christ. -- Encyclical "Quanto conficiamur," Aug. 10, 1863, etc. http://www.papalencyclicals.net/Pius09/p9syll.htm
Pope Pius IX, Singulari Quidem, March 17, 1856:
4. You see, dearly beloved sons and venerable brothers, how much vigilance is needed to keep the disease of this terrible evil from infecting and killing your flocks. Do not cease to diligently defend your people against these pernicious errors. Saturate them with the doctrine of Catholic truth more accurately each day. Teach them that just as there is only one God, one Christ, one Holy Spirit, so there is also only one truth which is divinely revealed. There is only one divine faith which is the beginning of salvation for mankind and the basis of all justification, the faith by which the just person lives and without which it is impossible to please God and to come to the community of His children. There is only one true, holy, Catholic church, which is the Apostolic Roman Church. There is only one See founded in Peter by the word of the Lord, outside of which we cannot find either true faith or eternal salvation. He who does not have the Church for a mother cannot have God for a father, and whoever abandons the See of Peter on which the Church is established trusts falsely that he is in the Church. http://www.papalencyclicals.net/Pius09/p9singul.htm
Pope Gregory XVI, Summo Iugiter Studio, May 27, 1832:
You know how zealously Our predecessors taught that very article of faith which these dare to deny, namely the necessity of the Catholic faith and of unity for salvation. The words of that celebrated disciple of the apostles, martyred St. Ignatius, in his letter to the Philadelphians [~AD 108] are relevant to this matter: "Be not deceived, my brother; if anyone follows a schismatic, he will not attain the inheritance of the kingdom of God." Moreover, St. Augustine and the other African bishops who met in the Council of Cirta in the year 412 explained the same thing at greater length: "Whoever has separated himself from the Catholic Church, no matter how laudably he lives, will not have eternal life, but has earned the anger of God because of this one crime: that he abandoned his union with Christ." Omitting other appropriate passages which are almost numberless in the writings of the Fathers, We shall praise St. Gregory the Great who expressly testifies that this indeed is the teaching of the Catholic Church. He says: "The holy universal Church teaches that it is not possible to worship God truly except in her and asserts that all who are outside of her will not be saved." Official acts of the Church proclaim the same dogma. Thus, in the decree on faith which Innocent III published with the synod of Lateran IV, these things are written: "There is one universal Church of all the faithful outside of which no one is saved." Finally the same dogma is also expressly mentioned in the profession of faith proposed by the Apostolic See, not only that which all Latin churches use, but also that which the Greek Orthodox Church uses and that which other Eastern Catholics use. We did not mention these selected testimonies because We thought you were ignorant of that article of faith and in need of Our instruction. Far be it from Us to have such an absurd and insulting suspicion about you. But We are so concerned about this serious and well known dogma, which has been attacked with such remarkable audacity, that We could not restrain Our pen from reinforcing this truth with many testimonies. http://www.papalencyclicals.net/Greg16/g16summo.htm
For, in effect, he scatters and gathers not who gathers not with the Church and with Jesus Christ, and all who fight not jointly with him and with the Church are in very truth contending against God. http://www.papalencyclicals.net/Leo13/l13sapie.htm
But this supremacy of man, which openly rejects Christ, or at least ignores Him, is entirely founded upon selfishness, knowing neither charity nor self-devotion. Man may indeed be king, through Jesus Christ: but only on condition that he first of all obey God, and diligently seek his rule of life in God's law. By the law of Christ we mean not only the natural precepts of morality and the Ancient Law, all of which Jesus Christ has perfected and crowned by His declaration, explanation and sanction; but also the rest of His doctrine and His own peculiar institutions. Of these the chief is His Church. Indeed whatsoever things Christ has instituted are most fully contained in His Church. Moreover, He willed to perpetuate the office assigned to Him by His Father by means of the ministry of the Church so gloriously founded by Himself. On the one hand He confided to her all the means of men's salvation, on the other He most solemnly commanded men to be subject to her and to obey her diligently, and to follow her even as Himself: "He that heareth you, heareth Me; and he that despiseth you, despiseth Me" (Luke x, 16). Wherefore the law of Christ must be sought in the Church. Christ is man's "Way"; the Church also is his "Way"-Christ of Himself and by His very nature, the Church by His commission and the communication of His power. Hence all who would find salvation apart from the Church, are led astray and strive in vain. http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_01111900_tametsi-futura-prospicientibus_en.html
Pope Gregory XVI, Mirari Vos, 15 August 1832:
“Now We consider another abundant source of the evils with which the Church is afflicted at present: indifferentism. This perverse opinion is spread on all sides by the fraud of the wicked who claim that it is possible to obtain the eternal salvation of the soul by the profession of any kind of religion, as long as morality is maintained. Surely, in so clear a matter, you will drive this deadly error far from the people committed to your care. With the admonition of the apostle that "there is one God, one faith, one baptism"(Ephesians 4,5) may those fear who contrive the notion that the safe harbor of salvation is open to persons of any religion whatever. They should consider the testimony of Christ Himself that "those who are not with Christ are against Him," (Luke 11,23) and that they disperse unhappily who do not gather with Him. Therefore "without a doubt, they will perish forever, unless they hold the Catholic faith whole and inviolate." (Symbol of Saint Athanasius) (...) This shameful font of indifferentism gives rise to that absurd and erroneous proposition which claims that liberty of conscience must be maintained for everyone. It spreads ruin in sacred and civil affairs, though some repeat over and over again with the greatest impudence that some advantage accrues to religion from it. "But the death of the soul is worse than freedom of error," as Augustine was wont to say (Epistle 166)”
Pope Pius X, Iucunda Sane, March 12, 1904:
Yet at the same time We cannot but remind all, great and small, as Pope St. Gregory did, of the absolute necessity of having recourse to this Church in order to have eternal salvation, to follow the right road of reason, to feed on the truth, to obtain peace and even happiness in this life. http://www.papalencyclicals.net/Pius10/p10greg.htm
Pope Benedict XV, Ad Beatissimi Apostolorum, November 1, 1914:
Such is the nature of Catholicism that it does not admit of more or less, but must be held as a whole or as a whole rejected: "This is the Catholic faith, which unless a man believe faithfully and firmly; he cannot be saved" (Athanas. Creed) http://www.papalencyclicals.net/Ben15/b15adbea.htm
Pope Pius XI, Mortalium Animos, January 6, 1928:
The Catholic Church alone is keeping the true worship. This is the font of truth, this is the house of faith, this is the temple of God; if any man enter not here, or if any man go forth from it, he is a stranger to the hope of life and salvation… Furthermore, in this one Church of Christ, no man can be or remain who does not accept, recognize and obey the authority and supremacy of Peter and his legitimate successors. http://www.papalencyclicals.net/Pius11/P11MORTA.HTM
Pope Pius XII, Mystici Corporis Christi, June 29, 1943:
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.” 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. And therefore if a man refuse to hear the Church let him be considered -- so the Lord commands -- as a heathen and a publican. 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.
41. They, therefore, walk in the path of dangerous error who believe that they can accept Christ as the Head of the Church, while not adhering loyally to His Vicar on earth. They have taken away the visible head, broken the visible bonds of unity and left the Mystical Body of the Redeemer so obscured and so maimed, that those who are seeking the haven of eternal salvation can neither see it nor find it. http://www.papalencyclicals.net/Pius12/P12MYSTI.HTM
27. Some say they are not bound by the doctrine, explained in Our Encyclical Letter of a few years ago, and based on the Sources of Revelation, 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. 28. 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. To them We are compelled with grief to repeat once again truths already well known, and to point out with solicitude clear errors and dangers of error. http://www.newadvent.org/library/docs_pi12hg.htm
Pope St. Gregory the Great (AD 590-604), Moralia, Book XIV, 5:
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. http://www.lectionarycentral.com/GregoryMoralia/Book14.html
Pope St. Pius X, E Supremi, On the Restoration of All Things in Christ, October 1903: