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
Historical reliability of the Gospels verbatim. The Synoptic Gospels are the primary sources of historical information about Jesus and of the religious movement he founded. They recount the life, ministry, crucifixion and resurrection of a Jew named Jesus, who spoke Aramaic. There are different hypotheses regarding the origin of the texts because the gospels of the New Testament were written in Greek for Greek-speaking communities, that were later translated into Syriac, Latin and Coptic. Mark is the primary source for information about Jesus. It was possibly composed in Rome or Antiochine Southern Syria. New Testament scholars generally credit its account of Jesus as a Galilean