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In reading Romans 7:13 we see that the law is holy, but the Old Covenant required the letter of the law to be kept in opposition to the indwelling sin nature. That is why the struggle is described in Romans 7:14-23, it is the mind/spirit against the flesh. The law was given to us because of transgressions to guard us and to show us our sin UNTIL Jesus came to take away our sin nature that produced sin and required the Law. The Laws of God's love are written on our hearts by the Holy Spirit, thus giving us life. We no longer have to keep laws we are in opposition to, requiring us to struggle. No, our new nature naturally wants to keep the laws of the Spirit of life in Christ, and we are no longer in the flesh, but in the Spirit which has freed us from the law of sin and death.
Galatians 5:16-18
16 I say then: Walk in the Spirit, and you shall not fulfill the lust of the flesh. 17 For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish. 18 But if you are led by the Spirit, you are not under the law.
Alert: Translators have capitalized the "S" in spirit, when it is talking about our mind, not the Holy Spirit. Those who are born again are not "in" the flesh, but in the Holy Spirit. It is one or the other, but not BOTH!
See Romans 7:25
So then, with the
mind I myself serve the law of God, but with the
flesh the law of sin.
The mind struggles against the flesh, and the flesh against the mind. That error has caused whole denominations to believe we can never be free from sin.