All of Paul's theology at Romans 6: 7–8 is that in his death, burial, and resurrection we identify with Christ and therefore have been transformed with a new set of desires. But we still have the remains of the body of sin in our limbs. It affects our body as well as our mind as if it were a person living within us. So where is the objection to choosing to submit to your "self" physically and spiritually? To the new desires of the Spirit or the desires of the "old man"? And what does the “mortification of sin” mean to you? This is about who you are in salvation. It is what goes into the equation of choice. There is a new you in salvation, where you no longer belong to yourself but to Someone else, so if you change and give new wishes, then naturally different from what was before, in other words, there is a new man.  

Well, that is the essence of the choice, because what you liked before, no longer like when you see yourself as alive to the new you.In other words, start to believe that you are different, and start to understand exactly what that difference is when you choose and be responsible, but in reality your life is no longer yours and in that sense you died of sin and now you are in Christ. I am saying that it is more than just saying that there is good and evil and that we choose between the two. It is not a life of moral choices; it is a new creation of the self. Our skills are ours and we control them all, but they have been renewed and then this change is the complexity of our decisions, here is the metaphysics, the will not like a scale that has a balance with objects of equal weight at each end. 

Since we prefer one object to another, we choose what we like the most.This affection has the understanding that is contained in our view of the object of choice, but the choice is not determined by the circumstances that come into our understanding, but rather by our desires and the state of our souls. There is a freedom of choice that the new experiences that the old didn't have. We are not a slave to our will, conscience, or the law. We are free in Christ. Our will is now a desire for pleasure