I. From the Two Books on the Promises.
And a little further on he adds:— John, moreover, nowhere gives us the name, whether as of himself directly (in the first person), or as of another (in the third person). But the writer of the Revelation puts himself forward at once in the very beginning, for he says: “The Revelation of Jesus Christ, which He gave to him to show to His servants quickly; and He sent and signified it by His angel to His servant John, who bare record of the Word of God, and of his testimony, and of all things that he saw.” And then he writes also an epistle, in which he says: “John to the seven churches which are in Asia, grace be unto you, and peace.” The evangelist, on the other hand, has not prefixed his name even to the catholic epistle; but without any circumlocution, he has commenced at once with the mystery of the divine revelation itself in these terms: “That which was from the beginning, which we have heard, which we have seen with our eyes.” And on the ground of such a revelation as that the Lord pronounced Peter blessed, when He said: “Blessed are you, Simon Bar-jona; for flesh and blood has not revealed it unto you, but my Father which is in heaven.” And again in the second epistle, which is ascribed to John, the apostle, and in the third, though they are indeed brief, John is not set before us by name; but we find simply the anonymous writing, “The elder.” This other author, on the contrary, did not even deem it sufficient to name himself once, and then to proceed with his narrative; but he takes up his name again, and says: “I John, who also am your brother and companion in tribulation, and in the kingdom and patience of Jesus Christ, was in the isle that is called Patmos for the Word of God, and for the testimony of Jesus Christ.” And likewise toward the end he speaks thus: “Blessed is he that keeps the sayings of the prophecy of this book; and I John who saw these things and heard them.” That it is a John, then, that writes these things we must believe, for he himself tells us.
5. What John this is, however, is uncertain. For he has not said, as he often does in the Gospel, that he is the disciple beloved by the Lord, or the one that leaned on His bosom, or the brother of James, or one that was privileged to see and hear the Lord. And surely he would have given us some of these indications if it had been his purpose to make himself clearly known. But of all this he offers us nothing; and he only calls himself our brother and companion, and the witness of Jesus, and one blessed with the seeing and hearing of these revelations. I am also of opinion that there were many persons of the same name with John the apostle, who by their love for him, and their admiration and emulation of him, and their desire to be loved by the Lord as he was loved, were induced to embrace also the same designation, just as we find many of the children of the faithful called by the names of Paul and Peter. There is, besides, another John mentioned in the Acts of the Apostles, with the surname Mark, whom Barnabas and Paul attached to themselves as companion, and of whom again it is said: “And they had also John to their minister.” But whether this is the one who wrote the Revelation, I could not say. For it is not written that he came with them into Asia. But the writer says: “Now when Paul and his company loosed from Paphos, they came to Perga in Pamphylia: and John, departing from them, returned to Jerusalem.” I think, therefore, that it was some other one of those who were in Asia. For it is said that there were two monuments in Ephesus, and that each of these bears the name of John.
6. And from the ideas, and the expressions, and the collocation of the same, it may be very reasonably conjectured that this one is distinct from that. For the Gospel and the Epistle agree with each other, and both commence in the same way. For the one opens thus, “In the beginning was the Word;”while the other opens thus, “That which was from the beginning.” The one says: “And the Word was made flesh, and dwelt among us; and we beheld His glory, the glory as of the Only-begotten of the Father.” The other says the same things, with a slight alteration: “That which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life: and the life was manifested.” For these things are introduced by way of prelude, and in opposition, as he has shown in the subsequent parts, to those who deny that the Lord has come in the flesh. For which reason he has also been careful to add these words: “And that which we have seen we testify, and show unto you that eternal life which was with the Father, and was manifested unto us: that which we have seen and heard declare we unto you.” Thus he keeps to himself, and does not diverge inconsistently from his subjects, but goes through them all under the same heads and in the same phraseologies, some of which we shall briefly mention. Thus the attentive reader will find the phrases, “the life,” “the light,” occurring often in both; and also such expressions as fleeing from darkness, holding the truth, grace, joy, the flesh and the blood of the Lord, the judgment, the remission of sins, the love of God toward us, the commandment of love an our side toward each other; as also, that we ought to keep all the commandments, the conviction of the world, of the devil, of Antichrist, the promise of the Holy Spirit, the adoption of God, the faith required of us in all things, the Father and the Son, named as such everywhere. And altogether, through their whole course, it will be evident that the Gospel and the Epistle are distinguished by one and the same character of writing. But the Revelation is totally different, and altogether distinct from this; and I might almost say that it does not even come near it, or border upon it. Neither does it contain a syllable in common with these other books. Nay more, the Epistle— for I say nothing of the Gospel— does not make any mention or evince any notion of the Revelation and the Revelation, in like manner, gives no note of the Epistle. Whereas Paul gives some indication of his revelations in his epistles; which revelations, however, he has not recorded in writing by themselves.
7. And furthermore, on the ground of difference in diction, it is possible to prove a distinction between the Gospel and the Epistle on the one hand, and the Revelation on the other. For the former are written not only without actual error as regards the Greek language, but also with the greatest elegance, both in their expressions and in their reasonings, and in the whole structure of their style. They are very far indeed from betraying any barbarism or solecism, or any sort of vulgarism, in their diction. For, as might be presumed, the writer possessed the gift of both kinds of discourse, the Lord having bestowed both these capacities upon him, viz., that of knowledge and that of expression. That the author of the latter, however, saw a revelation, and received knowledge and prophecy, I do not deny. Only I perceive that his dialect and language are not of the exact Greek type, and that he employs barbarous idioms, and in some places also solecisms. These, however, we are under no necessity of seeking out at present. And I would not have any one suppose that I have said these things in the spirit of ridicule; for I have done so only with the purpose of setting right this matter of the dissimilarity subsisting between these writings.
Source: Miscellaneous Fragments (New Advent)