The critical questions concerned with the Fourth Gospel are better known. But whether it is later than the later epistles of Paul, and whether it represents the result of their influence or is a parallel line of thought is another problem which has not yet been fully discussed: in any case, it is cognate with them. No one knows who wrote the Fourth Gospel. Tradition ascribes it to John the son of Zebedee, but all critical probability is against this theory. It seems tolerably clear that the Fourth Gospel was not written by an eye-witness, and that it implies not a knowledge of the historic Jesus so much as an acquaintance with the subapostolic Church. It is apparently an attempt to rewrite the story of Jesus in the interests of a "pre-existent" Christology, and of a high form of sacramental teaching. Tradition connects both the later Pauline epistles and the Fourth Gospel with the Province of Asia, and especially with Ephesus. There is no reason for doubting this tradition, but it is strange how soon its {123} creative spirit passed to Alexandria, a Church of which the origin is as obscure as the later history is famous. Tantalising though many of these problems are, there is no doubt as to the main characteristics of the Christianity of Ephesus and its neighbourhood. Its Christology was the reverse of Adoptionist. It did not think of Jesus as a man who had become divine, but as a God who had become human. Moreover, an identification of this pre-existent being with the Logos of the philosopher was gradually approached in the later Epistles, and finally made in the Prologue to the Fourth Gospel. The word Logos has an intricate and long history which has often been treated in books on the New Testament: it is quite unnecessary to repeat it at length. But it has not usually been sufficiently noted that the difficulty of the problems raised by it are mainly due to its use in different ways in different systems of thought. The popular Stoic philosophy, with its belief in a God immanent in the universe, could use Logos in the sense of the governing principle of the world, and as little less than a synonym, or, perhaps one should say, description of God. On the other hand, a transcendental theology such as Platonism, believing in a God entirely above all existence in the universe, needed a connecting link between God and the world, and could use Logos in this sense. Finally, a mediatising writer such as Cornutus could explain that the Logos was Hermes, and so triumphantly {124} reconcile philosophy and myth, by giving a mythological meaning to a philosophic term.