While some of the Slaves of the Immaculate Heart, as pseudo-relgious order founded by the woman Fr. Feeney derived his teachings from have been received back into the Church, and it was the later Cardinal Archbishop of Boston who promulgated the letter, it was the Holy OFfice, (now the Office of Doctrine and the Faith) which sent the letter to Boston to be published with the approval and blessings of Pope Pius XII. The letter condemning the very narrow and strict defining teachings of the St. Benedict Center is quoted in part below.

[quote:1shoscyd]…We are bound by divine and Catholic faith to believe all those things which are contained in the word of God, whether it be Scripture or Tradition, and are proposed by the Church to be believed as divinely revealed, not only through solemn judgment but also through the ordinary and universal teaching office (<Denzinger>, n. 1792).

Now, among those things which the Church has always preached and will never cease to preach is contained also that infallible statement by which we are taught that there is no salvation outside the Church.

However, this dogma must be understood in that sense in which the Church herself understands it. For, it was not to private judgments that Our Savior gave for explanation those things that are contained in the deposit of faith, but to the teaching authority of the Church.

Now, in the first place, the Church teaches that in this matter there is question of a most strict command of Jesus Christ. For He explicitly enjoined on His apostles to teach all nations to observe all things whatsoever He Himself had commanded (Matt. 28: 19-20).

Now, among the commandments of Christ, that one holds not the least place by which we are commanded to be incorporated by baptism into the Mystical Body of Christ, which is the Church, and to remain united to Christ and to His Vicar, through whom He Himself in a visible manner governs the Church on earth.

Therefore, no one will be saved who, knowing the Church to have been divinely established by Christ, nevertheless refuses to submit to the Church or withholds obedience from the Roman Pontiff, the Vicar of Christ on earth.

Not only did the Savior command that all nations should enter the Church, but He also decreed the Church to be a means of salvation without which no one can enter the kingdom of eternal glory.

In His infinite mercy God has willed that the effects, necessary for one to be saved, of those helps to salvation which are directed toward man’s final end, not by intrinsic necessity, but only by divine institution, can also be obtained in certain circumstances when those helps are used only in desire and longing. This we see clearly stated in the Sacred Council of Trent, both in reference to the sacrament of regeneration and in reference to the sacrament of penance (<Denzinger>, nn. 797, 807).

The same in its own degree must be asserted of the Church, in as far as she is the general help to salvation. Therefore, that one may obtain eternal salvation, it is not always required that he be incorporated into the Church actually as a member, but it is necessary that at least he be united to her by desire and longing.

However, this desire need not always be explicit, as it is in catechumens; but when a person is involved in invincible ignorance God accepts also an implicit desire, so called because it is included in that good disposition of soul whereby a person wishes his will to be conformed to the will of God.

These things are clearly taught in that dogmatic letter which was issued by the Sovereign Pontiff, Pope Pius XII, on June 29, 1943, <On the Mystical Body of Jesus Christ> (AAS, Vol. 35, an. 1943, p. 193 ff.). For in this letter the Sovereign Pontiff clearly distinguishes between those who are actually incorporated into the Church as members, and those who are united to the Church only by desire.

Discussing the members of which the Mystical Body is-composed here on earth, the same august Pontiff says: “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.”

Toward the end of this same encyclical letter, when most affectionately inviting to unity those who do not belong to the body of the Catholic Church, he mentions those who “are related to the Mystical Body of the Redeemer by a certain unconscious yearning and desire,” and these he by no means excludes from eternal salvation, but on the other hand states that they are in a condition “in which they 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” (AAS, 1. c., p. 243). With these wise words he reproves both those who exclude from eternal salvation all united to the Church only by implicit desire, and those who falsely assert that men can be saved equally well in every religion (cf. Pope Pius IX, Allocution, <Singulari quadam>, in <Denzinger>, n. 1641 ff.; also Pope Pius IX in the encyclical letter, <Quanto conficiamur moerore>, in <Denzinger>, n. 1677).

But it must not be thought that any kind of desire of entering the Church suffices that one may be saved. It is necessary that the desire by which one is related to the Church be animated by perfect charity. Nor can an implicit desire produce its effect, unless a person has supernatural faith: “For he who comes to God must believe that God exists and is a rewarder of those who seek Him” (Heb. 11:6). The Council of Trent declares (Session VI, chap. ” title=”Cool” />: “Faith is the beginning of man’s salvation, the foundation and root of all justification, without which it is impossible to please God and attain to the fellowship of His children” (<Denzinger>, n. 801).

From what has been said it is evident that those things which are proposed in the periodical <From the Housetops>, fascicle 3, as the genuine teaching of the Catholic Church are far from being such and are very harmful both to those within the Church and those without.

From these declarations which pertain to doctrine, certain conclusions follow which regard discipline and conduct, and which cannot be unknown to those who vigorously defend the necessity by which all are bound of belonging to the true Church and of submitting to the authority of the Roman Pontiff and of the Bishops “whom the Holy Ghost has placed . . . to rule the Church” (Acts 20:28).

Hence, one cannot understand how the St. Benedict Center can consistently claim to be a Catholic school and wish to be accounted such, and yet not conform to the prescriptions of canons 1381 and 1382 of the Code of Canon Law, and continue to exist as a source of discord and rebellion against ecclesiastical authority and as a source of the disturbance of many consciences.

Furthermore, it is beyond understanding how a member of a religious Institute, namely Father Feeney, presents himself as a “Defender of the Faith,” and at the same time does not hesitate to attack the catechetical instruction proposed by lawful authorities, and has not even feared to incur grave sanctions threatened by the sacred canons because of his serious violations of his duties as a religious, a priest, and an ordinary member of the Church.

Finally, it is in no wise to be tolerated that certain Catholics shall claim for themselves the right to publish a periodical, for the purpose of spreading theological doctrines, without the permission of competent Church authority, called the “<imprimatur,>“ which is prescribed by the sacred canons.

Therefore, let them who in grave peril are ranged against the Church seriously bear in mind that after “Rome has spoken” they cannot be excused even by reasons of good faith. Certainly, their bond and duty of obedience toward the Church is much graver than that of those who as yet are related to the Church “only by an unconscious desire.” Let them realize that they are children of the Church, lovingly nourished by her with the milk of doctrine and the sacraments, and hence, having heard the clear voice of their Mother, they cannot be excused from culpable ignorance, and therefore to them apply without any restriction that principle: submission to the Catholic Church and to the Sovereign Pontiff is required as necessary for salvation.[/quote:1shoscyd]
As to Unum Sanctum, the problem with it being used as an infallible pronouncement is that it only appears in parts as the original Bull has been lost, it seems that it was a reply to a statement by King Philip IV, King of France and cannot be understood outside the context of a conflict between the increasing power of secular rulers in France and England attempts to tax the clergy to support warfare not authorized by the Pope. To be an Infallible statement of the Pope, it would have had to be addressed to the entire Church, and fulfil the other requirements of an Ex Cathedra statement. As it seems that it was addressed to Rulers of countries which had felt that their authority was superior to the Pope when it came to taxing the Church and clergy, and to enter into wars against other Catholic Kingdoms, it was not applied to all, therefore not Infallible.