[HarleyD]

2Pe 3:15-16 "and regard the patience of our Lord as salvation; just as also our beloved brother Paul...wrote to you, as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction."

Please note that Peter equates Paul's writings to Scriptures. As some have tried to make a case that Paul's instruction to Timothy was in regards to the Old Testament; presumably Peter is equating Paul's writings to the Old Testament scriptures.

[annalex]

But Peter is not making a comparison between the merits of certain books; his statement is that some people distort both. One can say that the comparison implied in "also the rest of" is not intentional. If I say "first-graders do not understand Shakespeare as they also don't understand chemistry" I assert no equivalence between Shakespeare and chemistry.