It would be beyond belief, were it not so sadly familiar a fact, that some, professing honestly to interpret this passage, resolve the answer of the apostle into little or nothing more than the popular idea, as if the Sonship here referred to were only what any prophet or righteous man might claim. He surely must be wilfully blind who does not see that the apostolic answer which the Lord accepts is wide as the poles from the popular notions He so decisively rejects; and this is made peculiarly emphatic by the striking words with which the true answer is welcomed—the Saviour's first personal beatitude (as if to suggest, His is the kingdom of heaven—cf. Matt. v. 3, 10): "Blessed art thou, Simon Bar-jona: for flesh and blood hath not revealed it unto thee, but My Father which is in heaven." It will be remembered that, in asserting His own personal relation to the Father, Christ had said: "No man knoweth the Son, but the Father; neither knoweth any man the Father, save the Son, and he to whomsoever the Son will reveal Him" (xi. 27); and now that to one at least the Father has been revealed in the Son, He recognises the fact with joy. These notions of the people about Him were but earth-born notions, the surmisings of "flesh and blood": this faith of the true apostle was born from above; it could have come only from heaven.
Now at last, therefore, the foundation is laid, and the building of the spiritual temple is begun. The words which follow (ver. 18) are quite natural and free from most, if not from all, the difficulties in which perverse human ingenuity has entangled them, if only we bear in mind the circumstances and surroundings. The little group is standing on one of the huge rocky flanks of mighty Hermon, great boulders here and there around them; and in all probability, well in sight, some great stones cut out of the rock and made ready for use in building, like those still to be seen in the neighbourhood of Baalbec, to the north of Hermon; for this region was famous for its great temples. Now, when we remember that the two words our Lord uses (πέτρος and πέτρα) for "rock" in our version have not precisely the same meaning—the one (Petros, Peter) signifying a piece of rock, a stone, the other (Petra) suggesting rather the great bed-rock out of which these stones are cut and on which they are lying—we can understand that, while the reference is certainly in the first place to Peter himself, the main thing is the great fact just brought out that he is resting, in the strength of faith, on God as revealed in His Son. Thus, while Peter is certainly the piece of rock, the first stone which is laid upon the great underlying foundation on which all the faithful build, and therefore is in a sense—the common popular sense, in fact—the foundation stone, yet the foundation of all is the Bed-Rock, on which the first stone and all other stones are laid. Bearing this well in mind, we further see that there is no inconsistency between this and those other scriptures in which God is represented as alone the Rock of our salvation. The Bed-Rock, "the Rock of Ages," is here, as elsewhere, God as revealed in His Son, and Peter is the first stone "well and truly laid" upon it.
If the surroundings suggest the use of the words Petros and Petra, stone and rock, the circumstances suggest the use of the word Ecclesia, or Church, which is here employed by our Lord for the first time. Up to this time He has spoken always of the kingdom, never of the church. How is this to be explained? Of course the kingdom is the larger term; and now it is necessary that that portion of the kingdom which is to be organised on earth should be distinguished by a specific designation; and the use of the word "church" in preference to the more familiar "synagogue" may be accounted for by the desire to avoid confusion. Besides this, however, the word itself is specially significant. It means an assembly "called out," and suggests the idea of separateness, so appropriate to the circumstances of the little band of outcasts.
To see into this more fully, let us recall the recent teaching as to the true Israel (chap. xv.), no longer to be found in the old land of Israel. If there is to be an Israel at all, it must be reconstituted "outside the camp." In view of this, how strikingly significant is it that just as Abraham had to leave his country and go to a strange land to found the old theocracy, so Christ has to leave His country and go with His followers to these remote northern regions to constitute "the Israel of God," to inaugurate His Church, the company of those who, like these faithful ones, come out and are separate to be united by faith to Him! Christ with the Twelve around Him is the Israel of the New Testament; and we can imagine that it was on this occasion especially that in the prayers which we know from St. Luke's Gospel He offered in connection with this very conversation, He would find these words of devotion especially appropriate: "Behold, I and the children which God hath given Me" (Heb. ii. 13). The family of God (see chap. xii. 49) are by themselves apart, disowned by those who still bear unworthily the name of Israel; and most appropriate it is that on this occasion our Lord should begin to use that great word, which means first "called out" and then "gathered in": "on this rock I will build My Church."
When we think of the place and the scene and the circumstances, the sad memories of the past and the gloomy forebodings for the future, what sublimity of faith must we recognise in the words which immediately follow: "The gates of hell shall not prevail against it"! Oh! shame on us who grow faint-hearted with each discouragement, when the Master, with rejection behind Him and death before Him, found it encouragement enough after so much toil to make a bare beginning of the new temple of the Lord; and even in that day of smallest things was able to look calmly forward across the troubled sea of the dark future and already raise the shout of final victory!
But that day of victory is still far off; and before it can even begin to come, there must be a descent into the valley of the shadow of death. He is about to tell His disciples that He must go up to Jerusalem and die, and leave them to be the builders of the Church. He cannot continue long to be the Keeper of the keys; so He must prepare them for taking them from His hand when the time shall come for Him to go. Hence the words which follow, appropriately addressed in the first place to the disciple who had first confessed Him: "I will give unto thee the keys of the kingdom of heaven." "Honour to whom honour is due:" the first member of the Church is to be its prime minister as well. When the Master's voice shall be silent, the voice of the rock-disciple (and of the other disciples as well, for the same commission was afterwards extended to them all) shall have the same authority to bind, to loose, to regulate the administration of Church affairs as if He Himself were with them. It was not yet time to tell them how it would be—viz., by the coming and indwelling of His Spirit; it is enough now to give them the assurance that the infant Church shall not be left without authority from above, without power from on high.
The Church is founded; but for a time it must remain in obscurity. The people are not ready; and the gospel, which is to be the power of God unto salvation, is not yet complete, until He shall go up to Jerusalem and suffer many things and die. Till then all that has passed in this sacred northern retreat must remain a secret: "He charged His disciples that they should tell no man that He was the Christ" (R.V.).
II.—The Cross (xvi. 21-28).
A still more searching test must now be applied. It is not enough to discover what they have learned from their intercourse with Him in the past; He must find out whether they have courage enough to face what is now impending in the future. Their faith in God as revealed in Christ His Son has been well approved. It remains to be seen whether it is strong enough to bear the ordeal of the cross, to which it must soon be subjected: "From that time forth began Jesus to show unto His disciples, how that He must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed."
Already from time to time He had darkly hinted what manner of death He should die; but it was only from this time that He began to show it unto them, to put it before them so that they could not fail to see it. Herein see the wisdom and tender considerateness of "the Son of man." So dark and difficult a lesson would have been too much for them before. The ordeal would have been too severe. Not until their faith has begun with some firmness to grasp His true and proper divinity, can their hope live with such a prospect. There must be some basis for a faith in His rising again, before He can ask them even to look into the dark abyss of death into which He must descend. That basis is found in the confession of the rock-apostle; and relying on it He can trust them by-and-by, if not at once, to look through the darkness of the suffering and death to the rising again, the prospect of which He sets before them at the very same time: "and be raised again the third day." Besides, there was no possibility of their ever beginning to understand the atonement till they had grasped the truth of the incarnation. To this day the one is intelligible only in the light of the other. Those to whom Jesus of Nazareth is only "one of the prophets" cannot begin to see how He must suffer and die. Only those who with the apostles rise to the realisation of His divine glory are prepared to understand anything of the mystery of His Cross and Passion.