The marks of the Church are certain unmistakeable signs, or distinctive characteristics which render the Church easily recognizable to all, and clearly distinguish it from every other religious society, especially from those which claim to be Christian in doctrine and origin. That such external signs are necessary to the true Church is plain from the aim and the purpose which Christ had in view when He made His revelation and founded a Church. The purpose of the redemption was the salvation of men. Hence, Christ made known the truths which men must heed and obey. He established a Church to which He committed the care and the exposition of these truths, and, consequently He made it obligatory on all men that they should know and hear it ( Matthew 18:17 ). It is obvious that this Church, which takes the place of Christ, and is to carry on His work by gathering men into its fold and saving their souls, must be evidently discernible to all. There must be no doubt as to which is the true Church of Christ, the one which has received, and has preserved intact the Revelation which He gave it for man's salvation. Were it otherwise the purpose of the Redemption would be frustrated, the blood of the Saviour shed in vain, and man's eternal destination at the mercy of chance. Without doubt, therefore, Christ, the all-wise legislator, impressed upon His Church some distinctive external marks by which, with the use of ordinary diligence, all can distinguish the real Church from the false, the society of truth from the ranks of error. These marks flow from the very essence of the Church ; they are properties inseparable from its nature and manifestive of its character, and, in their Christian and proper sense, can be found in no other institution. In the Formula of the Council of Constantinople (A.D. 381), four marks of the Church are mentioned -- unity, sanctity, Catholicity, Apostolicity -- which are believed by most theologians to be exclusively the marks of the True Church. The present article considers unity.
All admit that unity of some kind is indispensable to the existence of any well-ordered society, civil, political, or religious. Many Christians, however, hold that the unity necessary for the true Church of Christ need be nothing more than a certain spiritual internal bond, or, if external, it need be only in a general way, inasmuch as all acknowledge the same God and reverence the same Christ. Thus most Protestants think that the only union necessary for the Church is that which comes from faith, hope, and love toward Christ; in worshipping the same God, obeying the same Lord, and in believing the same fundamental truths which are necessary for salvation. This they regard as a unity of doctrine, organization, and cult. A like spiritual unity is all the Greek schismatics require. So long as they profess a common faith, are governed by the same general law of God under a hierarchy, and participate in the same sacraments, they look upon the various churches -- Constantinople, Russian, Antiochene, etc. -- as enjoying the union of the one true Church ; there is the common head, Christ, and the one Spirit, and that suffices. The Anglicans likewise teach that the one Church of Christ is made up of three branches: the Greek, the Roman, and the Anglican, each having a different legitimate hierarchy but all united by a common spiritual bond.
The Catholic conception of the mark of unity, which must characterize the one Church founded by Christ, is far more exacting. Not only must the true Church be one by an internal and spiritual union, but this union must also be external and visible, consisting in and growing out of a unity of faith, worship, and government. Hence the Church which has Christ for its founder is not to be characterized by any merely accidental or internal spiritual union, but, over and above this, it must unite its members in unity of doctrine, expressed by external, public profession; in unity of worship, manifested chiefly in the reception of the same sacraments ; and in unity of government, by which all its members are subject to and obey the same authority, which was instituted by Christ Himself. In regard to faith or doctrine it may be here objected that in none of the Christian sects is there strict unity, since all of the members are not at all times aware of the same truths to be believed. Some give assent to certain truths which others know nothing of. Here it is important to note the distinction between the habit and the object of faith. The habit or the subjective disposition of the believer, though specifically the same in all, differs numerically according to individuals, but the objective truth to which assent is given is one and the same for all. There may be as many habits of faith numerically distinct as there are different individuals possessing the habit, but it is not possible that there be a diversity in the objective truths of faith. The unity of faith is manifested by all the faithful professing their adhesion to one and the same object of faith. All admit that God, the Supreme Truth, is the primary author of their faith, and from their explicit willingness to submit to the same external authority to whom God has given the power to make known whatever has been revealed, their faith, even in truths explicitly unknown, is implicitly external. All are prepared to believe whatever God has revealed and the Church teaches. Similarly, accidental differences in ceremonial forms do not in the least interfere with essential unity of worship, which is to be regarded primarily and principally in the celebration of the same sacrifice and in the reception of the same sacraments. All are expressive of the one doctrine and subject to the same authority.
That the Church which Christ instituted for man's salvation must be one in the strict sense of the term just explained, is already evident from its very nature and purpose; truth is one, Christ revealed the truth and gave it to His Church, and men are to be saved by knowing and following the truth. But the essential unity of the true Christian Church is also explicitly and repeatedly declared throughout the New Testament :
St. Paul likewise insists on the unity of the Church.
The other Apostles also persistently proclaimed this essential and necessary unity of Christ's Church (cf. 1 John 4:1-7 ; Apocalypse 2:6, 14-15, 20-29 ; 2 Peter 2:1-19 ; Jude 5:19). And although divisions did arise now and then in the early Church, they were speedily put down and the disturbers rejected, so that even from the beginning the Christians could boast that they were of "one heart and one soul " ( Acts 4:32 ; cf. Acts 11:22 ; 13:1 ).
Tradition is unanimous to the same effect. Whenever heresy threatened to invade the Church, the Fathers rose up against it as an essential evil.
That the mark of unity which is distinctive of and essential to the true Church of Christ is to be found in none other than the Roman Catholic Church, follows naturally from what has been said. All the theories of unity entertained by the sects are woefully out of harmony with the true and proper concept of unity as defined above and as taught by Christ, the Apostles, and all orthodox Tradition. In no other Christian body is there a oneness of faith, of worship, and of discipline. Between no two of the hundreds of non Catholic sects is there a common bond of union; each one having a different head, a different belief, a different cult. Nay more, even between the members of any one sect there is no such thing as real unity, for their first and foremost principle is that each one is free to believe and do as he wishes. They are constantly breaking up into new sects and subdivisions of sects, showing that they have within themselves the seeds of disunion and disintegration. Divisions and subdivisions have ever been the characteristics of Protestantism. This is certainly a literal fulfilment of the words of Christ: "Every plant which my heavenly Father hath not planted shall be rooted up" ( Matthew 15:13 ); and "every kingdom divided against itself shall be made desolate: and every city or house divided against itself shall not stand" ( Matthew 12:25 ).
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