I myself in my mind am a slave to God’s law, but in my sinful nature a slave to the law of sin

 Romans 7:1-25

for I am speaking to those who know the law—that the law has authority over someone only as long as that person lives? For example, by law a married woman is bound to her husband as long as he is alive, but if her husband dies, she is released from the law that binds her to him.

So, my brothers and sisters, you also died to the law through the body of Christ, that you might belong to another, to him who was raised from the dead, in order that we might bear fruit for God.

But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.

For sin, seizing the opportunity afforded by the commandment, deceived me, and through the commandment put me to death. So then, the law is holy, and the commandment is holy, righteous and good.

We know that the law is spiritual; but I am unspiritual, sold as a slave to sin. I do not understand what I do. For what I want to do I do not do, but what I hate I do. And if I do what I do not want to do, I agree that the law is good.

Thanks be to God, who delivers me through Jesus Christ our Lord! So then, I myself in my mind am a slave to God’s law, but in my sinful nature a slave to the law of sin.

Why?

The relationship between the Spirit of the Lord and sins in our body. We need get rid of our sins through Jesus Christ, only Jesus conquered the sins and the dead, so we can over sins and be righteous. But because we are living in our flesh body which is sinful nature and slave to the law of sin. 

How?

Rely on the Holy Spirit help us leading us be a slvae to God's law. This is a hard work and mission during our whole life.