07 2Peter 2:4 Does Peter quote Enoch?

07 2Peter 2:4 Does Peter quote Enoch?

Peter and Jude appear to be quoting the book of 1 Enoch, which is part of the psuedepigrapha. Why would they quote it? What does it mean when an apostle quotes from a non-biblical source? I think both Peter and Jude quote 1 Enoch, the way a teacher today might quote Harry Potter — to make a point based on popular culture.