What bearing has such an estimate of the Gospels upon the historic truth of the Virgin Birth tradition? Obviously, it does not save us from the trouble of testing the tradition by such tests as we can apply. That the tradition has found a place in the New Testament is not in itself a certificate of truth. The Evangelists certainly believed the tradition; they were intellectually honest; but they may have been mistaken. The ultimate question is the truth of the authorities upon which they rested and of the belief they reflect. Their importance as writers is that they countersign the tradition with the high authority they possess. But, however high their authority, it is not that of infallibility. The truth of the Gospels is the truth of their sources. As regards the Virgin Birth tradition, the sources cannot be traced back to Mk. and Q, the two primary Synoptic documents, but to the later tradition of the Christian Church, at the time when Mt. and Lk. were written. The First and Third Evangelists have endorsed that tradition; the problem of the Virgin Birth is whether they were right. Nothing that we have said in this section must be construed to prejudge that question. That the Evangelists have accepted the tradition, for us unquestionably gives it a higher value; but it is not a determinative value. The main result is to make yet clearer the final issue, which is, we repeat, whether the story which the Evangelists endorse can be traced back to an authoritative source. Has it the sanction of Mary or of those who may be supposed to have known her mind? IV. The Question of Alternative Theories In many discussions of the Virgin Birth, the question of _Alternative Theories_ occupies a prominent place. Our purpose in the present section is to ask what place it may legitimately be given. Has it the importance which is often claimed?