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 become the mind of the Church". Some synods of the 4th century published lists of canonical books (e.g. Hippo and Carthage). The existing 27-book canon of the New Testament was reconfirmed (for Roman Catholicism) in the 16th century with the Council of Trent (also called the Tridentine Council) of 1546, the Thirty-Nine Articles of 1563 for the Church of England, the Westminster Confession of Faith of 1647 for Calvinism, and the Synod of Jerusalem of 1672 for Eastern Orthodoxy. Although these councils did include statements about the canon, when it came to the New Testament they were only reaffirming the