Peter Williams, Warden, Tyndale House, Cambridge
The Relationship between Thomas and Tatian:
An Evaluation of a Recent Theory
It was William L. Petersenís Doktorvater who originated serious discussion of the relationship between the Diatessaron and the Gospel of Thomas. This relationship has been highlighted recently by Nicholas Perrin in his books Thomas and Tatian (2002) and Thomas, the Other Gospel (2007). Perrin proposes that Thomas was originally written in Syriac and that a series of catchwords runs through Thomas when one translates it back into Syriac. A representative sample of these catchwords is investigated and it is found that they provide no basis for the view that Thomas was composed in Syriac. Therefore the likelihood that Thomas used Tatianís Diatessaron is greatly diminished.