2 Timothy 3:16

2nd Timothy 3:16 is a popular verse for illustrating the importance of the Bible, and also in support of sola scriptura.

But am I the only one to have wondered if and how it can possibly be referring to itself? At the time it was written, the New Testament hadn't taken final shape, naturally (though I imagine that one or more of the Gospels and/or the Gospel source document(s) may have been around in some form). And it's far-fetched indeed to suppose that 2nd Timothy's writer included 2nd Timothy as Scripture, anyway.

That doesn't mean that 2nd Timothy isn't part of Christianity's biblical canon. Being actually written by an apostle is a good basis to trust it (all the shaky, disreputable other "gospels" don't have that basis).