6. But with these remarkable agreements coexist equally remarkable differences. Each writer has his own peculiarities of style, which appear more distinctly in the original than they can in any version. It has been noticed also by Biblical scholars that these peculiarities are more marked in the narrative than in the recitative parts of the gospels in question. Each writer, moreover, brings in incidents peculiar to himself, not in the form of patchwork, but as parts of a self consistent whole. So far is he from exact outward conformity to either of the other gospels, in respect to arrangement and circumstantial details, that the diversity between him and them in these particulars, sometimes creates serious difficulties when we attempt to arrange the three different narratives in the form of a harmony.
7. No theory of the origin of these three gospels can be true which does not explain both their coincidences and their differences. Hence we may set aside at once the hypothesis of their mutual dependence on each other—that the later evangelists used the writings of the earlier. By the different advocates of this theory, each of the three synoptic gospels has been made in turn the primary record from which the others drew; but no one of them has been able, upon this hypothesis, to account for the omissions or insertions of the supposed later evangelists, much less for the remarkable fact already noticed, that the peculiarities of each writer appear more fully in the narrative than in the recitative part of his gospel. The later evangelists may, indeed, have been acquainted with the writings of the earlier and have consulted them, but this supposition alone does not explain their peculiar coincidences and differences.
Another hypothesis is that of an original document or documents, from which all three are supposed to have drawn. The assumption of a single original written gospel, as the basis of our first three canonical gospels, is manifestly untenable. Had a primitive gospel existed of such compass and authority as to be the common source of our three synoptic gospels, it is inconceivable that the churches, which carefully preserved these three gospels, though two of them proceeded not from apostles themselves but only from their companions, should have allowed the original gospel so speedily and utterly to perish, that no traces of it remained in the days of Irenæus, Tertullian, and Clement of Alexandria. Besides, this hypothesis, as it was soon seen, does not explain the peculiar relation of these gospels to each other in respect to coincidences and differences. Hence various modifications were proposed—an original Aramaic gospel with various Greek translations, this original Aramaic gospel variously increased with new matter, etc. In a word, the form of these assumed original documents was hypothetically explained from the actual form of our three synoptic gospels; the very reverse of the true problem, which was to explain, from some reliable data, the form of the canonical gospels themselves.
The remaining hypothesis is that of oral tradition emanating from the apostles themselves, and maintained in its purity during their lives by their personal presence and teaching. That the gospel existed in this form alone for some years after the beginning of Christianity is admitted by all. The apostles were Christ's chosen witnesses of his life and teachings. From their lips proceeded the tradition which now constitutes our written gospels. The necessity of embodying this tradition in the form of permanent records was not felt at the beginning. But, as the churches were multiplied, oral tradition became liable to corruption in many ways through the multiplicity of the organs employed in its transmission. Then the need of written gospels began to manifest itself, and it was natural that the apostles should look to the supply of this need either by their own direct agency, or by that of men writing with their knowledge and approbation. How many years elapsed before the appearance of the earliest of our canonical gospels, which is commonly supposed to have been that of Matthew, we have no means of ascertaining with accuracy. But we may reasonably suppose that the period was long enough to allow the apostolic tradition of our Lord's life and teachings to assume a somewhat definite shape in respect to both matter and outward form. First, in respect to matter. As their public instructions could not cover the whole of our Saviour's history (John 20:30; 21: 25), they naturally selected, under the guidance of the Holy Spirit, those parts of it which embodied the spirit and meaning of the whole. Since, moreover, the apostles remained together at Jerusalem for some time after our Lord's ascension (Acts 8:1; 15:6), it is highly reasonable to suppose that in a matter of such moment they had a mutual understanding—an understanding which, while it interfered with the freedom of no one, secured a general agreement as to the points in our Lord's history and teachings which should be especially insisted on. Secondly in respect to outward form. While the apostles were preserved by the illumination of the Holy Spirit from any superstitious regard to the letter of our Lord's teachings, their reverence for him as a perfect teacher, whose words were truth unmixed with error, must have made them anxious to put the oral tradition of his sayings into as perfect a form as possible; whence the tradition of our Saviour's words would assume from the first a more fixed form than that of his life generally.
It is supposed by many that the writers of the first three gospels drew each from this common body of oral tradition such materials as suited his general plan; no one of them proposing to give the whole of our Lord's history, or even to observe a strict chronological order in the events recorded by him, any farther than such order was rendered necessary by their nature and essential connection. In the case of Matthew, who was one of the twelve apostles, it might be thought that he wrote simply from his own personal knowledge; but his gospel could not cover all the ground of our Lord's history as known to him, and we may well suppose that in the selection of his materials he had regard—not a servile, but a free regard—to the common oral tradition of the apostles, which was, in fact, the embodiment of their united wisdom under the illumination of the Divine Spirit. Each evangelist, as well Mark and Luke who were not apostles, as Matthew who belonged to the number of the twelve, wrote independently of the other two. The later writers may, indeed, have been acquainted with the writings of the earlier, but a bare inspection of the three gospels shows that there was no labored effort on the part of one evangelist to adjust his work to those of the others. Hence arise apparent discrepancies, as in the two genealogies of our Lord, which it is sometimes hard to explain. But these very difficulties witness to the independent truthfulness of the writers. Had they written in concert, or borrowed systematically from each other, such difficulties would not have existed.
Although apostolic oral tradition is thus made the main source whence the writers of these gospels drew their materials, it is not necessary to affirm or deny their use, in a subordinate way, of written documents. That such documents existed in the time of Luke we know from his own words, chap. 1:1. He does not condemn them, but neither does he rely upon them. His gospel is not derived from them, but from his own accurate investigations; "It seemed good to me also, having accurately traced out all things from the beginning" (as the original Greek means), "to write to thee in order, most excellent Theophilus." Chap. 1:3. And if Luke, the companion of Paul, was not dependent for his materials on any previously existing writings, neither was Mark, the companion of both Peter and Paul, nor Matthew, who was himself an apostle. Nor can the incorporation of such writings into the synoptic gospels be shown with any degree of probability. If it cannot be claimed for this hypothesis of a primitive apostolic tradition, as the source whence the writers of the synoptic gospels drew their materials, that it explains all the phenomena of their mutual relation to each other, it is, nevertheless, more satisfactory than any other that has been proposed, and may be regarded as a near approximation to the actual facts in the case.
Between the traditions of which the apostle Paul speaks (2 Thess. 2:15; 3:6; also, according to the original, 1 Cor. 11:2) received immediately from his mouth or pen, and the pretended traditions of later days, handed down from century to century through a succession of uninspired men, the difference is that between light and darkness, between truth and fiction. We have in the writings of the New Testament the genuine apostolic tradition, at first oral, but put into a written form during the lifetime of the apostles. These traditions are the "gold, silver, precious stones" of divine truth. All other traditions are the "wood, hay, stubble" of human origin. In settling the question respecting the genuineness of the New Testament writings, we proceed as in the case of any other writings. We avail ourselves of all the evidence within our reach, external and internal. We take the testimony of Irenæus and Tertullian, and also of Marcion and Valentinus; though none of them were inspired, and the two latter were heretical. But when we have once determined what books were written by apostles or apostolic men, these contain for us the only authoritative tradition, as defined by the apostle: "Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word or our epistle." 2 Thess. 2:15.
8. In comparing the synoptic gospels with each other and with the fourth gospel, we must ever bear in mind that no one of them professes to give a complete history of our Lord's life, or to arrange all the incidents which he relates in the exact order of time. Under the guidance of the divine Spirit each one pursues his own course, independently of the others, here inserting what one or more of the rest have omitted, or omitting what one or more of them have inserted; and here, again, bringing in incidents without regard to their exact chronological order, with some general preface like the following: "at that time," Matt. 12:1; "and he began again," Mark 4:1; "and it came to pass as he was alone praying," Luke 9:18; "and it came to pass as they went in the way," Luke 9:57; etc. Thus the wisdom of God has given us, not all the particulars of our Lord's history, but such a selection from both the incidents of his public life and his public and private teachings as best embodies the great facts of the gospel, and the doctrines and duties connected with them. In the four canonical gospels the church has, not all of our Lord's history and teachings, but all that the Holy Ghost judged needful for her establishment and edification to the end of time.