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
Development of the New Testament canon includes an explicit list of canonical books. Many Evangelical Christian groups (which have their origin in c. 1730 England) do not accept the theory that the Christian Bible was not known until various local and Ecumenical Councils, which they deem to be "Roman-dominated", made their official declarations. These groups believe that the New Testament supports that Paul (2 Timothy 4:11–13), Peter (2 Peter 3:15–16), and ultimately John (Revelation 22:18–19) finalized the canon of the New Testament. Some note that Peter, John, and Paul wrote 20 (or 21) of the 27-books of the NT and personally knew all the other NT