Leighton Pullan, The Books of the New Testament
“ A great Syrian father, Ephraim, who died in 373, wrote a commentary on the Diatessaron. This was preserved in an Armenian translation which was made known to the world in 1876. The discovery proved that the Diatessaron had been drawn from our four Gospels. In 1886 an Arabic version of the Diatessaron itself was found, and it {12} proved conclusively that Tatian's Diatessaron was simply a combination of our four canonical Gospels. About the same date as Tatian, a famous Gnostic writer named Heracleon wrote commentaries on Luke and John, and it can also be shown that he was acquainted with Matt. ”
