The "Silence" Against The Gospels
While in chat, Rook and I discussed the dating of the Gospels. It's my view that any dating of them, whether conservative or liberal, is fairly weak. Rook responded that evidence against earlier dating is the silence of 1st century sources as to their existence.
Now, besides possibly the G. Thomas, the (authentic) Pauline epistles, the Didache, and Clement, I know of no 1st century sources that could attest to the Gospels at all. I invite Rook to expand on his theories here.