The Catholic Church is by far the largest, the most widespread, and the most ancient of Christian communions in the world, and is moreover the mighty trunk from which the other communions claiming to be Christian have broken off at one time or another. If, then, we limit the application of the term Christendom to this, its most authentic expression, the unity of Christendom is not a lost ideal to be recovered, but a stupendous reality which has always been in stable possession. For not only has this Catholic Church ever taught that unity is an essential note of the true Church of Christ, but throughout her long history she has been, to the amazement of the world, distinguished by the most conspicuous unity of faith and government, and this notwithstanding that she has at all times embraced within her fold nationalities of the most different temperaments, and has had to contend with incessant oscillations of mental speculation and political power. Still, in another and broader sense of the term, which is also the more usual and is followed in the present article, Christendom includes not merely the Catholic Church, but, together with it, the many other religious communions which have either directly or indirectly, separated from it, and yet, although in conflict both with it and among themselves as to various points of doctrine and practice agree with it in this: that they look up to our Lord Jesus Christ as the Founder of their Faith, and claim to make His teaching the rule of their lives. As these separated communities when massed together, indeed in some cases even of themselves, count a vast number of souls, among whom many are conspicuous for their religious earnestness, this extension of the term Christendom to include them all has its solid justification. On the other hand, if it is accepted, it becomes no longer possible to speak of the unity of Christendom but rather of a Christendom torn by divisions and offering the saddest spectacle to the eyes. And then the question arises: Is this scandal always to continue? The Holy See has never tired of appealing in season and out of season for its removal but without meeting with much response from a world which had learnt to live contentedly within its sectarian enclosures. Happily a new spirit has lately come over these dissentient Christians, numbers of whom are becoming keenly sensitive to the paralyzing effects of division and an active reunion movement has arisen which, If far from being as widespread and solid as one could wish, is at least cherished on all sides by devout minds.
As determined by Christ
It is to the Gospels we must go in the first place if we desire to know what in the intentions of its Founder were to be the fundamental elements in the constitution of the Church, nor do the instructions He gave to His Apostles leave us in doubt on the subject. His last words, as reported by St. Matthew, are: "All power is given to Me in heaven and on earth. Going therefore make disciples (matheteusate) of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost, teaching them to observe all things whatsoever I have commanded you, and, lo, I am with you all days until the consummation of the world" (28:19-20). St. Mark's account is to the same effect, but adds important details: "Going into all the world, proclaim the Gospel to every creature. He that believeth and is baptized shall be saved, he that disbelieveth (ho de apistedaz) shall be condemned. And these signs shall follow those that believe: in my name they shall cast out devils, speak with new tongues, and take up serpents, and if they shall drink any deadly drink it shall not hurt them; and they shall lay their hands on the sick and they shall be healed. . . . And they going forth preached everywhere, the Lord co-operating with them, and confirming their words by the signs that accompanied them" (16:15-20). St. Luke, in Acts 1:8, preserves words of Christ which fit in with these two accounts: "You shall receive the power of the Holy Ghost that will come down upon you, and you shall be My witnesses in Jerusalem, and in all Judæa and Samaria, and to the ends of the earth"; whilst in his Gospel this Evangelist has recorded how Jesus Christ in His post-Resurrection discourses to His disciples enumerated as among the primary doctrinal facts to be thus attested by the Apostles and preached throughout the world, the fulfilment in Jesus of the Old-Testament prophecies, and the remission of sins through His name: "These are the words which I have spoken to you whilst I am still with you, for it is necessary that all things which are written of Me in Moses and the Prophets and the Psalms be fulfilled; and He said to them: For thus it is written that the Christ must suffer and rise again from the dead on the third day, and repentance be preached in His name for the remission of sins to all nations, beginning from Jerusalem. And you shall be witnesses to these things. And I will send down upon you that [gift] which has been promised to you by My Father. Remain therefore in this city until you be endued with power from on high" (xxiv, 44-49).
Further, to go back to St. Matthew, this Evangelist tells us, in a most impressive passage intimately connected with the plan of his Gospel, that Christ made provision for unity of action among His Apostles by appointing one of them to be the leader of his brethren, and assigning to him a unique relation to the spiritual building He was raising. "And I say to thee that thou art Peter [i.e. the Rock], and upon this Rock I will build my Church, and the gates of hell shall not prevail against it; and I will give thee the keys of the kingdom of heaven, and whatsoever thou shalt bind on earth shall be bound in heaven, and whatsoever thou shalt loose on earth shall be loosed in heaven" (xvi, 18, 19). St. Luke (22:31-32) has words spoken in the supper-room which imply this previous appointment of St. Peter, by describing in other terms the same firm support which it would be his to communicate to the faith of the Church. "Simon, Simon, Satan hath desired to have you that he may sift you as wheat, but I have prayed for thee that thy faith may not fail, and do thou when thou art converted" (or it may mean, "do thou in thy turn") "confirm thy brethren." St. John, whose Gospel follows a different course from the Synoptics, and seems to select for narration previously unrecorded deeds and words of Christ which cast a fuller light on what the others had given, tells of Jesus Christ's final reiteration of the commission to St. Peter rendered necessary perhaps to reassure him after his fall and deep repentance, and entrusting him anew with the supreme pastoral charge of the entire flock. "Simon, Son of John, lovest thou me more than these . . . feed My lambs . . . be the shepherd of my sheep" (21:15-17). To St. John, too, we are indebted for our knowledge of a fact which accords well with the words, "Lo, I am with you always", reported by St. Matthew; for he testifies that on the occasion of the Last Supper Jesus Christ promised to send the Spirit of Truth, who proceeds from the Father, and "will bear testimony of me" (15:26) and "will lead you into all truth" (16:13); also that on the same occasion He prayed an effectual prayer for His disciples and "those who through their word should come to believe in him, that they all may be one, even as Thou, Father, art one in me, and I am one in Thee, so that they may be one in us, and thus the world may believe that thou hast sent me" (17:20-23).
Were we arguing with the Rationalistic critics we should have to meet their refusal to grant the authenticity of much that is in these passages, but the question of reunion is practical only for those who accept fully and in all respects the authority of the canonical Scriptures. If, then, we take these passages together as utterances of the same Divine voice, reaching us through these different channels, the conclusion is irresistible that the Church was founded by Christ on the principle of a revelation to which, as attested by the word of God, unquestioning assent is due from all to whom it is addressed; on the principle of an authority communicated by Christ to chosen representatives whom He set as teachers of the world, and to whom He requires that the world should render the obedience of faith; and on the principle of a single religious communion, under the rule of these teachers and their duly appointed successors, admission to which is through the gate of baptism and adherence to which is imposed on all under the most solemn sanctions. For:
the duty assigned to the hearers is simply to believe what the Apostles impart to them as teaching derived from Jesus Christ, no liberty being allowed for disbelief on the ground that the Apostolic teaching does not commend itself to the judgment of the disciple; and this duty is declared to be so imperative that the fulfilment of it places a man in the way of salvation, but disregard of it in the way of Divine condemnation — the implication being that, as this teaching comes ultimately from Christ, that fact in itself should be held to give the disciple a better guarantee of truth than any reasoning of his own could give.
The Apostles are sent by Christ in like manner as He was sent by His Father, and to the chief of them are given the keys of the kingdom of heaven with a far-reaching power to make binding laws which must mean that He sends them forth to continue the work He had begun, to make disciples as He had done, and to rule them in the spirit of the Good Shepherd as He had done; consequently, that He delegates to these Apostles such share of the authority given to Himself as He deemed necessary for the discharge of their world-wide commission.
The community thus formed out of the Apostolic teachers and their disciples was necessarily one by a twofold bond of union, inasmuch as the teaching, being from God, was necessarily one, and the faith with which it had to be received was correspondingly one, inasmuch too, as the visible society into which all were baptized was essentially one, being under the rule of a body of pastors united under the presidency of a single visible head.
The words, "I am with you always until the consummation of the world", prove, what indeed was presumable from the nature of the case, that Christ was then instituting a system not intended for the Apostolic generation only, but for all the generations to come, and hence that He was addressing His Apostles, not as eleven individual men only, but as men who, with their legitimate successors, formed a moral personality destined to last through the ages.
We may further gather from the texts above cited that the revelation thus brought down from heaven and imparted to the world to be the means of its salvation was not confined to a few ethical maxims, lit up by the splendour of a surpassing example and of such simplicity that all men in all ages could without difficulty reconcile them on intrinsic grounds with the dictates of their personal reason. On the contrary, it is expressed in terms of unlimited range — "teaching them all that I have commanded" — and is explicitly declared to contain first and foremost in its doctrinal whole the mystery which surpasses all others in baffling human speculation, namely, the mystery of the Holy Trinity — "baptizing them in the name of the Father, and of the Son, and of the Holy Ghost" — in other words, for this is the meaning, dedicating them by baptism to the worship of (eis to honoma), and therefore to belief in the Trinity in Unity.
At the same time, that the human mind, in thus giving its assent to doctrines so difficult for it to conceive may do no violence to its own rational nature, the above passages tell us of the promise of the Spirit to abide for ever in the Church, to guide at all times the mind of the teaching body, organized under its visible head, so that it may always be kept from corrupting the sacred doctrine, and presenting it for acceptance in a form foreign to its original purity.
Lastly, that we may understand the vital importance of this unity of communion, of this unity of truth, for the due carrying out of the Church's work, we have the prayer of Christ to His Father to teach us that the spectacle of it was intended by Him to furnish the world with the most signal and convincing proof of the divinity of the Christian religion: "That even as the Father is in Me, and I in Him, so they may be one in Us, that the world may believe that Thou hast sent Me." We can appreciate the character of this motive, we who live in an age when the divisions of Christendom are cast in our faces as evidence of the uncertainty on which the Christian pretensions rest. We can see how it would facilitate Christian work at home and in the mission field, if we could still say, as in the time of the Apostles, "The universality of those that believe are of one heart and one soul." We can understand how discerning observers, weighing the natural tendency of human minds to differ, would, in the presence of such a world-wide unity, be fain to exclaim, "This is something that surpasses the power of nature; the hand of God is here."
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