"You have to understand that the canon was not the result of a series of contests involving church politics. The canon is rather the separation that came about because of the intuitive insight of Christian believers. They could hear the voice of the Good Shepherd in the gospel of John; they could hear it only in a muffled and distorted way in the Gospel of Thomas, mixed in with a lot of other things. "When the pronouncement was made about the canon, it merely ratified what the general sensitivity of the church had already determined. You see, the canon is a list of authoritative books more than it is an authoritative list of books. These documents didn't derive their authority from being selected; each one was authoritative before anyone gathered them together. The early church merely listened and sensed that these were authoritative accounts."
Found that in the interview with Bruce Metzger