
The first mark by which the true Church of Christ can be identified is unity or oneness.
The Roman Catechism explains, “The faith which all are bound to believe and to profess is one.”
That faith which all are bound to believe and to profess consists in the written word of God and in tradition, and those which are proposed by the Church, either in a solemn pronouncement or in her ordinary and universal teaching power, to be believed as divinely revealed, all the judgments and decrees of the Apostolic See, and all points of doctrine proposed by the Church’s authoritative magisterium. [1]
Opinions are not part of the Faith. Catholics may disagree on opinions, which have not been settled by the Church.[2]
God through St. Paul declared to the Ephesians (4:5), “One Lord, one faith, one baptism.”
For this reason, the public sin of apostasy, heresy, and schism causes persons to be severed from the Church by its very nature. If the Church had visible apostates, heretics, and schismatics, it wouldn’t be visibly one. [3]
Pope Pius XI declared in Mortalium Animos #10: “For since the mystical body of Christ, in the same manner as His physical body, is one, compacted and fitly joined together, it were foolish and out of place to say that the mystical body is made up of members which are disunited and scattered abroad: whosoever therefore is not united with the body is no member of it, neither is he in communion with Christ its head.”
Since the mark is a visible sign of the true Church, it must appear so in the external forum. It’s on this account that theologians can disagree on whether occult heretics are members of the Body of the Church. The Body refers to the external forum. The Soul represents the internal forum. Occult heretics are not united to the Soul of the Church. It’s also on this account that St. Robert Bellarmine could say, “For although Liberius was not a heretic, nevertheless he was considered one, on account of the peace he made with the Arians, and by that presumption the pontificate could rightly be taken from him: for men are not bound, or able to read hearts; but when they see that someone is a heretic by his external works, they judge him to be a heretic pure and simple, and condemn him as a heretic.” (De Romano Pontifice, II, 29)
A church that appears divided in faith is obviously missing the first mark. A church whose laity disagrees with its leader on a doctrine of faith most definitely does not possess the first mark.
Footnotes
[1] The First Vatican Council declared: [The object of faith]. Further, by divine and Catholic faith, all those things must be believed which are contained in the written word of God and in tradition, and those which are proposed by the Church, either in a solemn pronouncement or in her ordinary and universal teaching power, to be believed as divinely revealed. (Dogmatic Constitution concerning the Catholic Faith, Ch. 3, FIRST VATICAN COUNCIL, Pope Pius IX) (Denz. 1792)
Pope Pius IX declared in Quanta Cura, Dec. 8, 1864: “And, we cannot pass over in silence the boldness of those who “not enduring sound doctrine” [II Tim. 4:3], contend that “without sin and with no loss of Catholic profession, one can withhold assent and obedience to those judgments and decrees of the Apostolic See, whose object is declared to relate to the general good of the Church and its right and discipline, provided it does not touch dogmas of faith or morals.” There is no one who does not see and understand clearly and openly how opposed this is to the Catholic dogma of the plenary power divinely bestowed on the Roman Pontiff by Christ the Lord Himself of feeding, ruling, and governing the universal Church.”
“You will firmly abide by the true decision of the Holy Roman Church and to this Holy See, which does not permit errors.” (Lateran Council V, Bull ‘Cum postquam’ by Pope Leo X)
Pope Leo XIII declared in Satis Cognitum (# 9), June 29, 1896: “The practice of the Church has always been the same, as is shown by the unanimous teaching of the Fathers, who were wont to hold as outside Catholic communion, and alien to the Church, whoever would recede in the least degree from any point of doctrine proposed by her authoritative Magisterium.”
[2] Theological opinions are free views on aspects of doctrines concerning Faith and morals, which are neither clearly attested in Revelation nor decided by the Teaching Authority of the Church. Their value depends upon the reasons adduced in their favour (association with the doctrine of Revelation, the attitude of the Church, etc.).
A point of doctrine ceases to be an object of free judgment when the Teaching Authority of the Church takes an attitude which is clearly in favour of one opinion. Pope Pius XII explains in the Encyclical “Humani generis” (1950): “When the Popes in their Acts intentionally pronounce a judgment on a long disputed point then it is clear to all that this, according to the intention and will of these Popes, can no longer be open to the free discussion of theologians” (D 3013). (Ludwig Ott, Fundamentals of Catholic Dogma)
[3] Pope Pius XII, Mystici Corporis Christi: “For not every sin, however grave it may be, is such as of its own nature to sever a man from the Body of the Church, as does schism or heresy or apostasy.”
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