The law of the Spirit of life in Christ Jesus has set you free from the law of sin and death.
God has done what was impossible for the Law, since it was weak because of selfishness. God condemned sin in the body by sending his own Son to deal with sin in the same body as humans, who are controlled by sin.
He did this so that the righteous requirement of the Law might be fulfilled in us. Now the way we live is based on the Spirit, not based on selfishness.
People whose lives are based on selfishness think about selfish things, but people whose lives are based on the Spirit think about things that are related to the Spirit.
The attitude that comes from selfishness leads to death, but the attitude that comes from the Spirit leads to life and peace.
So the attitude that comes from selfishness is hostile to God. It doesn't submit to God's Law, because it can't.
People who are self-centered aren't able to please God.
But you aren't self-centered. Instead you are in the Spirit, if in fact God's Spirit lives in you. If anyone doesn't have the Spirit of Christ, they don't belong to him.
If Christ is in you, the Spirit is your life because of God's righteousness, but the body is dead because of sin.
If the Spirit of the one who raised Jesus from the dead lives in you, the one who raised Christ from the dead will give life to your human bodies also, through his Spirit that lives in you.
So then, brothers and sisters, we have an obligation, but it isn't an obligation to ourselves to live our lives on the basis of selfishness.