What? No e-mail?!

Note that in this period, there was no public postal system, and so Christians had to invest their own personal and financial resources in disseminating their texts. Their readiness to do so is both impressive and without parallel among religious groups of the time.— Destroyer of the gods: Early Christian Distinctiveness in the Roman World, page 132

A written prophecy

[I]t is equally important to note that, unlike the books of the Old Testament prophets, Revelation does not present itself as the secondary written deposit of a set of oracles that were originally declared orally. Instead, in this case, from the first, this prophecy was delivered in written form. In fact, the author claims that this was by divine mandate, a heavenly voice ordering him, “Write in a book what you see and send it to the seven churches” (1:11), and early in the book the author pronounces a blessing upon “the one who reads aloud the words of the prophecy” in the context of Christian gatherings and upon “those who hear and keep what is written in it” (1:3).— Destroyer of the gods: Early Christian Distinctiveness in the Roman World, page 126

What did Paul say?

[I]t is striking that both the author of 2 Peter and those whom he regards as “ignorant and unstable”(v. 16) seem to share a high regard for Paul’s letters. That is, the author and those other Christians whom he denigrates here disagreed over how to interpret Paul’s letters, but they apparently agreed that they are authoritative texts whose interpretation matters. Clearly, the scriptural status of Paul’s letters was rather widely affirmed across various Christian groups already by the date of 2 Peter (ca. 70–140 AD?), even among Christians who strongly disagreed with one another over other matters of faith.— Destroyer of the gods: Early Christian Distinctiveness in the Roman World, page 114