I. Tatian, a follower of Justin Martyr, and who flourished about the year 170, composed a harmony, or collation of the Gospels, which he called Diatessaron, of the four. The title, as well as the work, is remarkable; because it shows that then, as now, there were four, and only four, Gospels in general use with Christians. And this was little more than a hundred years after the publication of some of them. (Lardner, Cred. vol. i. p. 307.) II. Pantaenus, of the Alexandrian school, a man of great reputation and learning, who came twenty years after Tatian, wrote many commentaries upon the Holy Scriptures, which, as Jerome testifies, were extant in his time. (Lardner, Cred. vol. i. p. 455.) III. Clement of Alexandria wrote short explications of many books of the Old and New Testament. (Lardner, Cred. vol. ii. p. 462.) IV. Tertullian appeals from the authority of a later version, then in use, to the authentic Greek. (Lardner, Cred. vol. ii. p. 638.) V. An anonymous author, quoted by Eusebius, and who appears to have written about the year 212, appeals to the ancient copies of the Scriptures, in refutation of some corrupt readings alleged by the followers of Artemon. (Lardner, Cred. vol. iii. p. 46.) VI. The same Eusebius, mentioning by name several writers of the church who lived at this time, and concerning whom he says, "There still remain divers monuments of the laudable industry of those ancient and ecclesiastical men," (i. e. of Christian writers who were considered as ancient in the year 300,) adds, "There are, besides, treatises of many others, whose names we have not been able to learn, orthodox and ecclesiastical men, as the interpretations of the Divine Scriptures given by each of them show." (Lardner, Cred. vol. ii. p. 551.) VII. The last five testimonies may be referred to the year 200; immediately after which, a period of thirty years gives us Julius Africanus, who wrote an epistle upon the apparent difference in the genealogies in Matthew and Luke, which he endeavours to reconcile by the distinction of natural and legal descent, and conducts his hypothesis with great industry through the whole series of generations. (Lardner, Cred. vol. iii. p. 170.) Ammonius, a learned Alexandrian, who composed, as Tatian had done, a harmony of the four Gospels, which proves, as Tatian's work did, that there were four Gospels, and no more, at this time in use in the church. It affords also on instance of the zeal of Christians for those writings, and of their solicitude about them. (Lardner, Cred. vol. iii. p. 122.) And, above both these, Origen, who wrote commentaries, or homilies, upon most of the books included in the New Testament, and upon no other books but these. In particular, he wrote upon Saint John's Gospel, very largely upon Saint Matthew's, and commentaries, or homilies, upon the Acts of the Apostles. (Lardner, Cred. vol. iii. pp. 352, 192, 202 & 245.)