WWE Smackdown #21.  Well, not really.  This discussion began around the issue of the DaVinci Code (and neither are nice to Dan Brown), but it’s mostly about the Gospels–canonical and non-canonical–on their historical reliability, etc.  In the middle Richard Hays brought up a point about why the 4 gospels are accepted as authoritative and the others were not: Beyond the fact that they are earlier, he pointed out that they present the most continuity to the OT.  That is, the salvation-historical continuity of the message of the four gospels with Judaism is what the early church found compelling.  (This is especially true for Irenaeus–see especially his Demonstration of the Apostolic Preaching which is very OT-NT focused.)  See here.

HT: Summa Philosophiae