Development of the New Testament canon a novelty in Irenaeus's time. "Against Heresies" 3.11.7 acknowledges that many heterodox Christians use only one gospel while 3.11.9 acknowledges that some use more than four. The success of Tatian's Diatessaron in about the same time period is "...a powerful indication that the fourfold Gospel contemporaneously sponsored by Irenaeus was not broadly, let alone universally, recognized." Irenaeus apparently quotes from 21 of the New Testament books and names the author he thought wrote the text. He mentions the four gospels, Acts, the Pauline epistles with the exception of Hebrews and Philemon, as well as the first epistle of Peter, and
Greek New Testament their chief foundations being: Greek New Testament The Greek New Testament is the original form of the books that make up the New Testament as they appeared in Koine Greek, the common dialect from 300 BC to 300 AD. There are several Greek-language versions of the New Testament that approximate the original form of the New Testament books in Greek. The first published edition of the Greek New Testament was produced by Erasmus in 1516. There are multiple Greek copies of the New Testament Byzantine text-types, used by the Greek Orthodox Church. There exist multiple copies of the New Testament