On this point, I look at who the writings are directed to, I think that's relevant. My simplest example is to remember that God told Noah, not me, to build an ark.And as for such and such letter written by such and such apostle to such and such a group, does that mean it doesn't apply to you?
Remember, the Jews had to learn too. They are being taught, just as you should be taught. Continue to study the Word, and God will tell you what you need to work on. The Gospel is very simple. Jesus Christ's righteousness covers us, and the Holy Spirit is given so we can grow. If we are faithful in what He has shown us, and continue the walk with Him, and read His word, we will be fine. He is not beating us over the head--He is teaching us.
Peter's letters were addressed to the dispersed Jews, and fit best reading with that in mind. There is a certain Jewishness to the writing and to things referrenced in the letters. Just the same, they are not only written to Jews of the Diaspora, but they were written to Christian Jews, and address matters of Christianity, which things are true for us as well as them.
Paul was the Apostle to the gentile Christians, and that's me. He letters were directly written for my benefit. Except the part of about bringing his parchments and winter cloak. Although, I was truly blessed studying all the people in Romans 16! So there is something to be gained from all of it, even though certain portions were addressed to us, and certain portions to others.
Just some thought on this, what do you think?
Much love!