Romans 8:3,4

What the law could not do in that it was weak through the flesh, God did by sending His own Son in the likeness of sinful flesh, on account of sin:  He condemned sin in the flesh, that the righteous requirement of the law might be fulfilled in us who do not walk according to the flesh but according to the Spirit.

The law does not make us righteous and the sins of the flesh cannot be made right by the law. Jesus became our sin substitute so the law could be fulfilled and we made righteous. We are to walk then according to the spirit and control our flesh. Our spirit is who we are not the flesh and the spirit is meant to rule the flesh.  When we walk by the spirit we fulfill the righteous requirement of the law.