I think the question is, how exactly do we overcome?We've been made the righteousness of Christ, yes....this is in our renewed inner man (why we delight in the law of God after the inner man) But there is a conflict with the old/outer man and this is the area where we need to overcome.
For me - my life isn't easy, my inner battles are deep and ugly - I find the power to overcome in the truth of my reconciliation to God. I'm reconciled to God in Christ Jesus, and though I am changeable He is not, and His priesthood is based on an everlasting life, and He ever lives to make intercession for me. And therefore I am fully and completely "saved".
Knowing that God is with me, for He has promised, I will never leave you nor forsake you, knowing that He loves me, that He is active in my life controlling all those things that I cannot, to make them work for my good, knowing these things frees me to not regard sins committed, to joy in His forgiveness. It frees me to look to Him to make those changes in me that I struggle to make, and fail, in my own efforts.
When I stop trying to be better so that God will be OK with me I find myself getting better without effort. Knowing that He will transform me - the surety of my salvation - I find the purity of heart that I seek.
If I'm trying to control my bad thinking and bad behavior so that I can be OK with God, then I'm trying to use my own efforts to attain to what Christ accomplished in His death and resurrection. And that's not a spirit endeavor, it's fleshy, lacking faith in Christ, that He in fact reconciled us.
And once we've taken up fleshy thinking, we need to stop, and get back to spiritual thinking. Trusting in Christ.
And I'm not saying we aren't to do what the Bible tells us all to do. Be holy as I am holy, that's the command I yearn to keep in all my being! But I don't find holiness something I can try to be and then just do. I only seem to find holiness when I'm, well, cuddled up to God in His loving arms. It's like the flesh can't follow there.
Much love!