Paul taught that it was meaningless dung to not murder? Or did Paul teach the spirit of the law and men then saw Gods holy standard and then men realized that it was impossible for men? Because most people will outwardly keep the law to not murder for all of their lives and it is not dung to do so, but every person will have anger in their heart sometime.
Paul was after winning Christ. He spoke of a higher calling that he pressed forward toward. He was after the prize - he wanted to abide/remain in Christ, which is to not sin at ALL. He counted all his own efforts as dung compared to THAT prize. He didnt try to mix the right that man can do with the righteousness/holiness of God.
But you certainly arent going to ever abide in Christ, walking in the Spirit, by circumventing, or getting rid of, the law of God. Do you think Jesus was trying to get rid of the law of God when He taught that anger in your heart is to have already murdered? No, He wasn't trying to do away with Gods law. A man who doesnt murder outwardly is doing the righteousness that a man can do. To not even murder in your heart, EVER, is not within a mans power but is only possible when and if he walks in the Spirit in holiness.
Paul wasn't saying one must stop trying to not murder men in order to not murder men. He wasnt saying that in order to not commit adultery one must stop trying to not commit adultery.
It isnt bad to not shoot and kill someone. But it's not holiness unless you dont even do it in your heart, which is impossible for men. So Paul speaks of the higher calling, a walk in holiness.
"winning Christ"...
I think you have a puzzling idea, about this concept.
Winning Christ is not pursued by commandment keeping or law keeping.
We are not more like God the more we keep the commandments.
I can promise you that Heaven will be full of people that were not good at keeping the commandments, and hell will be full of people that spent their lives worrying about keeping them, and kept them, mostly.
If possible, you should read my previous Threads that discuss how to stop repenting and confessing and failing as a Christian.
This Thread is actually about that topic, but legalist came to it and turned it into their typical legalistic self saving rabbit trail.
See, its one thing to talk about the need to be more "Christ-like", but if you dont know how to do it, then all talk about statues, the Old Testament commandments, and similar, is just talk.
Most believers have a warped and broken Christianity.
I can show you how to cure the wrong believing which has ruined most believer's Christianity.