Gospel of Thomas in the late 2nd century that "since there are four quarters of the earth ... it is fitting that the church should have four pillars ... the four Gospels" ("Against Heresies", 3.11.8), and then shortly thereafter made the first known quotation from a fourth gospel—the canonical version of the Gospel of John. The late 2nd-century Muratorian fragment also recognizes only the three synoptic gospels and John. Bible scholar Bruce Metzger wrote regarding the formation of the New Testament canon, "Although the fringes of the emerging canon remained unsettled for generations, a high degree of unanimity concerning the greater part of
New Testament as citations of the New Testament by ancient authors and the New Testament text in lectionaries in order to reconstruct the earliest recoverable form of the New Testament text and the history of changes to it. Books that later formed the New Testament, like other Christian literature of the period, originated in a literary context that reveals relationships not only to other Christian writings, but also to Graeco-Roman and Jewish works. Of singular importance is the extensive use of and interaction with the Jewish Bible and what would become the Christian Old Testament. Both implicit and explicit citations, as well