In Romans chapter 6 Paul gives his readers some choices though he only considers one of the options as being that of a true Christian.
In verses 1 and 15 he asks questions that we should never have to consciously answer because one of the options is unthinkable for a Christian. If we have to think about how we would respond there is concern as to whether we really are a Christian.
A person without Christ always sins all of the time and has no choice in the matter. Just because an act appears moral doesn’t mean it is not sin. We have such a wrong idea of sin. Sin is not wrong doing, it is wrong being. Sin is any moment when Jesus Christ is not allowed to function as our sovereign master from a glad and willing heart.
Do not let sin be sovereign over your body. The evidence that you are is that you let your body dictate to your mind to satiate its own pleasure and lusts. Do not surrender your body to satiate its sinful lusts and desires.
Do present your whole being in surrender to God for His will and purpose and do give your body to serve His righteousness and not its sinful desires.
Paul says that we have a choice to whom we present ourselves (v 16) but one of the options is absolutely absurd to a Christian.
Since we have chosen righteousness in Christ for eternity why would we want to live under sin’s power in the present since we have seen its fruit (v 21)?
In verse 16 Paul also writes that if we allow sin to have its way in us then it will lead to sin having a greater hold over us. On the other hand if we surrender ourselves to God for His righteousness it will lead to God having greater rule and power in and through us for righteousness To continue to remain under sin’s rule is absurd since we have been voluntarily set free from it (v 18, 22) Notice Paul writes this twice to make sure we don’t miss it.