by Monsignor Joseph Clifford Fenton

analysis of, Cantate Domino:
 
(1) All of those outside the Church, even the individuals who have committed no sin against the faith itself, are in a position in which they cannot be saved unless they in some way enter or join the Church before they die.
 
(2) The alternative to eternal and supernatural salvation is deprivation of the Beatific Vision. In the case of those who are guilty of mortal sin which remains unrepented, this includes both the penalty of loss and the penalty of sense in hell.
 
(3) The spiritual condition of one who is not “within” the Church at least by an act of implicit desire is incompatible with the reception of the life of sanctifying grace.
 
This document insists that pagans, Jews, heretics, and schismatics will not be saved unless, before the end of their lives, they are joined (aggregati) to the one true Church. p. 40-41

Pius IX

 
… it is perfectly possible for a man to die “outside” the true Church and to be excluded from the Beatific Vision forever without having his ignorance of the true Church or of the true religion counted as a moral fault. That is precisely what Pope Pius IX said in the Singulari quadam. He said it, as the context shows, as part of his explanation of the fact that the Catholic dogma of the Church’s necessity for the attainment of eternal salvation in no way involves a contradiction of the doctrines about God’s sovereign mercy and justice.
 
In this section of the Singulari quadam Pope Pius IX goes on to urge the Bishops of the Catholic Church to use all of their energies to drive from the minds of men the deadly error that the way of salvation can be found in any religion. To a certain extent this is a mere restatement of the erroneous opinion according to which we may well hope for the salvation of men who have never entered in any way into the Catholic Church, the first misinterpretation of Catholic teaching…
 
One of the most interesting factors in this section of the allocution is the fact that Pope Pius IX forbids his people to inquire into the presence or the lack or the extent of invincible ignorance in individual cases. He actually goes so far as to insist that it is wrong to go beyond the teaching that there is one God, one faith, and one baptism. p. 47
 
The primary and central object of the Church’s doctrinal ministry is to be found in the body of truth revealed by God through Our Lord Jesus Christ, and delivered to the Church by His Apostles as doctrine to be accepted with the assent of divine faith. The secondary object of that ministry embraces all and only those truths which the Church must be able to teach inerrantly in order to teach its primary object adequately as a living and infallible teaching body. The decision as to just what would constitute invincible, as distinct from vincible or culpable, ignorance of the Catholic Church in any individual case does not fall within the confines of either object. And, as a matter of fact, this decision is something which man in this life is quite incapable of forming rightly. p.48
 
On, Singulari quadam:
 
(1) It is a ruinous error to imagine that one can have grounds for hope that people now dead, and who had not entered into the Church in any way during the course of their lives, are saved.

(2) The dogma that there is no salvation outside the Catholic Church is in no way opposed to the truth that God is all-merciful and all-just.

(3) The doctrine that no one is saved outside the Catholic Church is a truth revealed by God through Jesus Christ, and a truth which all men must believe with the assent of divine faith. It is a Catholic dogma.
(4) Invincible ignorance, of the true Church or of anything else, is not considered by God as a sin. The dogma that there is no salvation outside the Catholic Church in no way implies that invincible ignorance is sinful.

(5) It is an impious and deadly error to hold that salvation may be attained in any religion.

(6) It is not within the field either of our competence or of our rights to search out the way in which God’s mercy and His justice operate in any given case of a person ignorant of the true Church or of the true religion. We shall see how these divine attributes have operated in the light of the Beatific Vision itself. p. 56