The law of Moses could not save us, because of our sinful nature. But God put into effect a different plan to save us. He sent his own Son in a human body like ours, except that ours are sinful. God destroyed sin's control over us by giving his Son as a sacrifice for our sins.
He did this so that the requirement of the law would be fully accomplished for us F27 who no longer follow our sinful nature but instead follow the Spirit.
Those who are dominated by the sinful nature think about sinful things, but those who are controlled by the Holy Spirit think about things that please the Spirit.
But you are not controlled by your sinful nature. You are controlled by the Spirit if you have the Spirit of God living in you. (And remember that those who do not have the Spirit of Christ living in them are not Christians at all.)
The Spirit of God, who raised Jesus from the dead, lives in you. And just as he raised Christ from the dead, he will give life to your mortal body by this same Spirit living within you.