'Letters' in the Bible

This letter which I am now writing to you, dear friends, is my second letter. In both my letters I seek to revive in your honest minds the memory of certain things,

That is what he says in all his letters, when speaking in them of these things. In those letters there are some statements hard to understand, which ill-taught and unprincipled people pervert, just as they do the rest of the Scriptures, to their own ruin.