What needs to be explained in both cases is the way in which the later narratives came to be compiled. Within a hundred years from the date commonly assigned to the Crucifixion, there are Gentile traces of a Jesuist or Christist movement deriving from Jewry, and possessing a gospel or memoir as well as some of the Pauline and other epistles, both spurious and genuine; but the gospel then current is seen to have contained some matter not preserved in the canonical four, and to have lacked much that those contain. Of those traces the earliest are found in one epistle of Clement called Bishop of Rome (fl. about 100), which, whether genuine or not, is ancient, and in the older form of the epistles ascribed to the Martyr Ignatius (d. about 115?) of which the same may be said. About the middle of the second century the writings of Justin Martyr tell of a Christist memoir, but show no knowledge of the Pauline epistles. All alike tell of a spreading cult, with a theology not yet coherently dogmatic, founding mainly on a crucified Jesus, faith in whom ensures salvation.
Like the letters of Paul, those ascribed to Clement and Ignatius tell of schisms and bitter strifes in the churches: that is the constant note of Christian history from first to last. As to rites, we have but a bare mention of the eucharist and of baptism; the story of the founder's parentage is still unknown to the makers of documents, and his miracles are as unheard of as most of his teachings. There is nothing in Clement, or in the older Ignatian epistles, or in that ascribed to Polycarp (circa 150), or in that of Barnabas (same period), to show knowledge of the existing gospels of Luke or John; a solitary parallel to Luke being rather a proof that the passage echoed had been taken from some earlier document; and the gospel actually cited as late as Justin is certainly not identical with either Mark or Matthew. Even from Paul there is hardly any quotation; and Clement, who mentions or is made to mention his epistles to the Corinthians, pens a long passage in praise of love which has no quotation from the apostle's famous chapter on that head, though it would have seemed made for his purpose. In view of their lax way of quoting the Old Testament we may infer that the early Fathers or forgers had few manuscripts; and it is plain that they set no such store by Christian documents as they did by the Jewish; but the fact remains that they fail to vouch for much even of those Pauline epistles which commonly rank as incontestable. At times, as in the Pauline use of the word ektroma (1 Cor. xv, 8), which occurs in a similar phrase in one of the Ignatian epistles, there is reason to suspect that the "apostolic" writing has been interpolated in imitation of the "post-apostolic." In the latter the expression is appropriate; in the former it is not.