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
New Testament of the New Testament. These were all extremely important figures in the early church, writers would have mentioned their deaths if the New Testament had been written later. Furthermore, the Gospels contain numerous attacks on the Sadducees, a sect of Judaism that was wiped out with the destruction of the temple. Why, they ask, would later writers devote so much narrative space to attacking a group that no longer existed? John Robinson also notes that each book of the New Testament had to be written prior to the destruction of The Temple. Robinson notes that most scholars interpret the Olivet