Irenaeus John the Apostle, and that the Gospel of Luke was written by Luke, the companion of Paul. Scholars contend that Irenaeus quotes from 21 of the 27 New Testament Texts: Matthew ("Book 3, Chapter 16") Mark ("Book 3, Chapter 10") Luke ("Book 3, Chapter 14") John ("Book 3, Chapter 11") Acts of the Apostles ("Book 3, Chapter 14") Romans ("Book 3, Chapter 16") 1 Corinthians ("Book 1, Chapter 3") 2 Corinthians ("Book 3, Chapter 7") Galatians ("Book 3, Chapter 22") Ephesians ("Book 5, Chapter 2") Philippians ("Book 4, Chapter 18") Colossians ("Book 1, Chapter 3") 1 Thessalonians ("Book 5, Chapter
Development of the New Testament canon on the left side; they four also had the face of an eagle"—equivalent to the "four-formed" gospel, is the origin of the conventional symbols of the Evangelists: lion (Mark), ox (Luke), eagle (John), man (Matthew). Irenaeus was ultimately successful in declaring that the four gospels collectively, and exclusively these four, contained the truth. By reading each gospel in light of the others, Irenaeus made of "John" a lens through which to read "Matthew", "Mark" and "Luke". Based on the arguments Irenaeus made in support of only four authentic gospels, some interpreters deduce that the "fourfold Gospel" must have still been