Extra ecclesiam nulla salus! That is what you want to search for - “Outside the Church there is no salvation”. The clarifying documentation helps to explain the “ordinary” vs. the “extraordinary” means. It gets a bit tough to discern through the language used, but the constant teaching of the Church is there.
Pope Boniface VIII, in his bull of 1302 entitled , asserted in the strongest possible terms that “it is absolutely necessary for the salvation of every human creature to be subject to the Roman Pontiff.”
Pope Eugene IV issued the Bull in 1441, which states the following: (N)o one remaining outside the Catholic Church, not just pagans, but also Jews or heretics or schismatics, can become partakers of eternal life; but they will go to the “everlasting fire which was prepared for the devil and his angels” (Matt. 25:41), unless before the end of life they are joined to the Church… And no one can be saved, no matter how much alms he has given, even if he sheds his blood for the name of Christ, unless he remains in the bosom and the unity of the Catholic Church (Denziger 715).
This dogma must be understood in that sense in which the Church herself understands it. For, it was not to private judgments that Our Saviour gave for explanation those things that are contained in the deposit of faith, but to the teaching authority of the Church (, in , 1952, vol. 127, pp. 308-15).
In other words, the magisterial texts…can only be interpreted in context and in the light of other, equally authoritative Magisterial teachings not only in order to avoid confusion or charges that the Church has changed her teaching, but because it is only in harmony with the Magisterium of today that magisterial texts of yesterday may be rightly understood.
The protocol mentions, for example, Pope Pius IX’s 1863 encyclical . In this document, while cautioning against the error of religious indifferentism, the pontiff simultaneously affirmed the inexhaustible mercy of God, who really does desire that all men be saved and come to full knowledge of the truth (cf. 1 Tim. 2:4).
Pope Pius XII, in his 1943 encyclical , to which the 1949 protocol also makes reference. The protocol summarizes the pope’s teaching by saying that while membership in the Church is indeed an absolute requirement for salvation, such membership does not necessarily have to be visible to the human eye, and can be characterized by even “desire and longing,” whether explicit (in the case of catechumens) or implicit (in the case of the invincibly ignorant). At the same time, however, the pope affirms that those souls in the latter case “cannot be sure of their salvation” since “they still remain deprived of those many heavenly gifts and helps which can only be enjoyed in the Catholic Church.”
Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience—those too may achieve eternal salvation (, #16).
Pope John Paul II’s 1990 encyclical repeats this same doctrine:
But it is clear that today, as in the past, many people do not have an opportunity to come to know or accept the Gospel revelation or to enter the Church… For such people, salvation in Christ is accessible by virtue of a grace which, while having a mysterious relationship to the Church, does not make them formally a part of the Church but enlightens them in a way which is accommodated to their spiritual and material situation. This grace comes from Christ; it is the result of his sacrifice and is communicated by the Holy Spirit. It enables each person to attain salvation through his or her free cooperation.