[1330] On Valentinus, see chap. 11, note 1. That Tatian was Gnostic in many of his tendencies is plain enough not only from these words of Irenæus, but also from the notices of him in other writers (cf. especially Hippolytus, Phil. VIII. 9). To what extent he carried his Gnosticism, however, and exactly in what it consisted, we cannot tell. He can hardly have been a pronounced follower of Valentinus and a zealous defender of the doctrine of Æons, or we should find him connected more prominently with that school. He was, in fact, a decided eclectic, and a follower of no one school, and doubtless this subject, like many others, occupied but a subordinate place in his speculations.
[1331] That the Severians, whoever they were, were Encratites in the wide sense, that is, strict abstainers from flesh, wine, and marriage, cannot be denied (compare with this description of Eusebius that of Epiphanius in Hær. XLV., also Theodoret's Hær. Fab. I. 21, who says that Apolinarius wrote against the Severian Encratites,--a sign that the Severians and the Encratites were in some way connected in tradition even though Theodoret's statement may be unreliable). But that they were connected with Tatian and the Encratitic sect to which he belonged, as Eusebius states, is quite out of the question. Tatian was a decided Paulinist (almost as much so as Marcion himself). He cannot, therefore, have had anything to do with this Ebionitic, anti-Pauline sect, known as the Severians. Whether there was ever such a person as Severus, or whether the name arose later to explain the name of the sect (possibly taken from the Latin severus, "severe," as Salmon suggests), as the name Ebion was invented to explain the term Ebionites, we do not know. We are ignorant also of the source from which Eusebius took his description of the Severians, as we do not find them mentioned in any of the earlier anti-heretical works. Eusebius must have heard, as Epiphanius did, that they were extreme ascetics, and this must have led him, in the absence of specific information as to their exact position, to join them with Tatian and the Encratites,--a connection which can be justified on no other ground.
[1332] ouk oid' hopos. Eusebius clearly means to imply in these words that he was not acquainted with the Diatessaron. Lightfoot, it is true, endeavors to show that these words may mean simply disapproval of the work, and not ignorance in regard to it. But his interpretation is an unnatural one, and has been accepted by few scholars.
[1333] to dia tess?ron. Eusebius is the first one to mention this Diatessaron, and he had evidently not seen it himself. After him it is not referred to again until the time of Epiphanius, who in his Hær. XLVI. 1 incorrectly identifies it with the Gospel according to the Hebrews, evidently knowing it only by hearsay. Theodoret (Hær. Fab. I. 20) informs us that he found a great many copies of it in circulation in his diocese, and that, finding that it omitted the account of our Lord's birth, he replaced it by the four Gospels, fearing the mischief which must result from the use of such a mutilated Gospel. In the Doctrine of Addai (ed. Syr. and Engl. by G. Phillips, 1876), which belongs to the third century, a Diatessaron is mentioned which is without doubt to be identified with the one under consideration (see Zahn I. p. 90 sq.). Meanwhile we learn from the preface to Dionysius bar Salibi's Commentary on Mark (see Assemani, Bibl. Or. I. 57), that Ephraem wrote a commentary upon the Diatessaron of Tatian (Tatianus Justini Philosophi ac Martyris Discipulus, ex quator Evangeliis unum digessit, quod Diatessaron nuncupavit. Hunc librum Sanctus Ephraem commentariis illustravit). Ephraem's commentary still exists in an Armenian version (published at Venice in 1836, and in Latin in 1876 by Moesinger). There exists also a Latin Harmony of the Gospels, which is without doubt a substantial reproduction of Tatian's Diatessaron, and which was known to Victor of Capua (of the sixth century). From these sources Zahn has attempted to reconstruct the text of the Diatessaron, and prints the reconstructed text, with a critical commentary, in his Tatian's Diatessaron. Zahn maintains that the original work was written in Syriac, and he is followed by Lightfoot, Hilgenfeld, Fuller, and others; but Harnack has given very strong reasons for supposing that it was composed by Tatian in Greek, and that the Syriac which Ephraem used was a translation of that original, not the original itself. Both Zahn and Harnack agree, as do most other scholars, that the work was written before Tatian became a heretic, and with no heretical intent. Inasmuch as he later became a heretic, however, his work was looked upon with suspicion, and of course in later days, when so much stress was laid (as e.g. by Irenæus) upon the fourfold Gospel, Christians would be naturally distrustful of a single Gospel proposed as a substitute for them. It is not surprising, therefore, that the work failed to find acceptance in the Church at large. For further particulars, see especially Zahn's monograph, which is the most complete and exhaustive discussion of the whole subject. See also Harnack's Ueberlieferung der Griech. Apologeten, p. 213 ff., Fuller's article referred to in note 1, the article by Lightfoot in the Contemporary Review for May, 1877, and those by Wace in the Expositor for 1881 and 1882.
[1334] i.e. of Paul, who was quite commonly called simply ho apostolos. This seems to imply that Tatian wrote a work on Paul's epistles (see note 1, above).
[1335] logos ho pros Ellenas: Oratio ad Græcos. This work is still extant, and is one of the most interesting of the early apologies. The standpoint of the author is quite different from that of Justin, for he treats Greek philosophy with the greatest contempt, and finds nothing good in it. As remarked in note 1, above, the Oratio was probably written after Tatian had left Rome for the first time, but not long after his conversion. We may follow Harnack (p. 196) in fixing upon 152 to 153 as an approximate date. The work is printed with a Latin translation and commentary in Otto's Corp. Apol. Vol. VI. The best critical edition is that of Schwartz, in v. Gebhardt and Harnack's Texte und Untersuchungen, IV. 1 (Leipzig, 1888), though it contains only the Greek text. An English translation is given in the Ante-Nicene Fathers, Vol. II. p. 59-83.
[1336] Tatian devotes a number of chapters to this subject (XXXI., XXXV.-XLI). Eusebius mentions him, with Clement, Africanus, Josephus, and Justus, in the preface to his Chron. (Schöne, II. p. 4), as a witness to the antiquity of Moses, and it is probable that Julius Africanus drew from him in the composition of his chronological work (cf. Harnack, ibid. p. 224). Clement of Alexandria likewise made large use of his chronological results (see especially his Strom. I. 21), and Origen refers to them in his Contra Cels. I. 16. It was largely on account of these chapters on the antiquity of Moses that Tatian's Oratio was held in such high esteem, while his other works disappeared.