The righteousness is not mine, it is Christ’s. I have no righteousness apart from Him. I am to put on His righteousness. It is not just that I can finally behave righteously in Christ. It is that He is my righteousness. There is not much – strike that – anything that I can do to approximate His righteousness, I can’t do better – I am a fool to try. It is only as I clothe myself with Him that I can stand. [Do a quick search on “put on” in Paul’s letters as back up to this…]
One point of this is that our understanding of Scripture continually improves. Not just mine, all of us. That includes all of our favorite pastors, authors, speakers, etc. All of us are at some level getting it wrong and learning more each day. Why is that? We are studying the infinite, with finite understanding. Therefore we are – or should – be continually learning, revising, and sharpening our understanding of Him. That process only ends when we see Him face to face.