The first three Gospels do not contain the name of the writers in any connection which can be used to prove conclusively that they were written by the men whose names they bear. On the other hand, the fourth Gospel in a concluding passage (John xxi. 24) contains an obvious claim to have been written by that intimate friend of Jesus to whom the Church has always attributed it. But the titles, "according to Matthew," "according to Mark," "according to Luke," rest on excellent authority. And they imply that each book contains the good news brought by Christ and recorded in the teaching of the evangelist specified. These titles must, _at the very least_, signify that the Christians who first gave these titles to these books, meant that each Gospel was connected with one particular person who lived in the apostolic age, and that it contained nothing contrary to what that person taught. The titles, taken by themselves, are therefore compatible with the theory that the first three Gospels were perhaps written by friends or disciples of the men whose names they bear. But we shall afterwards see that there is overwhelming evidence to show that the connection between each book and the specified person is much closer than that theory would suggest. Speaking of the four Gospels generally, we may first observe that it is impossible to place any one of them as late as A.D. 100, {11} and that the first three Gospels must have been written long before that date. This is shown by the internal evidence, of which proof will be given in detail in the chapters dealing with the separate Gospels. The external evidence of the use of all the four Gospels by Christians, and to some extent by non-Christians, supports the internal evidence. Let us begin by noting facts which are part of undoubted history, and then work back to facts of earlier date. It is now undisputed that between the years 170 and 200 after Christ our four Gospels were known and regarded as genuine products of the apostolic age. St. Irenaeus, who became Bishop of Lyons in France in A.D. 177, and was the pupil of Polycarp, who had actually been a disciple of St. John, uses and quotes the four Gospels. He shows that various semi-Christian sects appeal severally to one of the four Gospels as supporting their peculiar views, but that the Christian Church accepts all four. He lays great stress on the fact that the teaching of the Church has always been the same, and he was personally acquainted with the state of Christianity in Asia Minor, Rome, and France. His evidence must therefore be considered as carrying great weight. Equally important is the evidence of Tatian. This remarkable Syrian wrote a harmony of the Gospels near A.D. 160. Allusions to this harmony, called the _Diatessaron_, were known to exist in several ancient writers, but until recently it was strenuously maintained by sceptical writers that there was not sufficient evidence