Davy, The first 8 chapters of Romans is one teaching. Paul is teaching on Sin and the Law, then not being under the law but grace but still not sinning, and then Romans 7 is about why the Law didn't work - our sin nature - constant struggle between mind and flesh; and the cream de la cream - the SPIRIT and the replacement of the sin nature. "There is therefore now no condemnation to those who are in Christ Jesus, who do not walk according to the flesh, but according to the Spirit. 2 For the law of the Spirit of life in Christ Jesus has made me free from the law of sin and death. 3 For 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, 4 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."
No matter what you say now, you made a rash statement in your other post, saying that Romans 7 isn't for the Church.
Irregardless that Paul was teaching about the differences between our flesh and our spirit in Romans 7, it is a very... important teaching, and is part of his Message to all Churches in Christ Jesus. And no, you cannot just isolate it from the rest of the Romans chapters like you've wrongly been taught to do, because your teachers don't really understand that chapter themselves. Another reason you cannot is because Paul is actually covering the same subjects throughout the whole Book of Romans, the difference between the law vs. God's grace, and the flesh vs. spirit, the old world vs. the world to come, all in relation to The Gospel of Jesus Christ. That info isn't just in chapter 7.
The "sin nature" idea is a modern invention of men's philosophy. It is in modern translations from men's ideas, not in the actual Bible texts. We sin because we are in the flesh. That is what Apostle Paul showed in Romans 6, which is a clear account, and not some philosophical idea of man that refuses to pinpoint what sin actually is (transgression of God's laws).
And as I have said before, Paul gave a CONDITION to be in Christ's grace after we have believed on Him and been baptized. We have to stay in the walk with Him and not fall away. That condition of staying in Christ is especially taught in Romans 6 & 8. And the warning of falling away into sin again is given (Romans 6:13-23).
Understanding Romans 7:
Many don't understand Romans 7. They can't grasp that God's laws can still be in effect for Christianity while being under grace. The matter is actually very simple, many just don't want to admit it. Romans 7 goes along with what Paul taught in 1 Timothy 1 about God's laws. Our Lord Jesus did not nail all of God's law to His cross. Colossians 2 says Jesus nailed the handwriting of ordinances in the law to His cross. That didn't mean the Ten Commandments, nor many laws that are still in effect today like what Paul covered in 1 Timothy 1. Many in the Grace Movement don't like to hear this, and preach against it. But they are actually going against Christian Doctrine in Paul's Epistles.
In Romans 7, Apostle Paul is showing us that while we are in yet in this flesh body, we cannot escape sin, because like he also said in Galatians 3:22, the Scripture has concluded us all under sin, so that the promise by faith of Jesus Christ might be given to them that believe. Paul said in Rom.6 to reckon ourselves dead unto sin by faith in Christ, but he never said that means we cannot ever still sin in our flesh. Just the opposite, Romans 7 shows that we still will sin because of our flesh. Paul even reveals that in the strong sense that 'we are going to still sin at times', not can still sin, but we are still going to at times, regardless of what one thinks.
So like Paul showed in Romans 7:23-25, Who shall deliver us from this "body of death"? Paul last said there thusly, with the mind (our spirit) we serve the law of God, but with our flesh the law of sin. In other words, because of our flesh we will always remain imperfect and will slip up at times and still sin. Our spirit won't be released from this fleshy "body of death" until our Lord Jesus returns.
By that Paul is showing us who caused us to have this "body of death". It wasn't Adam's sin, as that was not actually the very first sin that brought death. Satan is who sinned from the beginning, and God judged and sentenced him to death back when he first rebelled. Thus the concept of death and imperfection was caused by Satan in the world of old. That is why the power of death was assigned to Satan (Hebrews 2:14-15.)
So how did Christ's Apostles teach to handle this situation? just ignore future sins we may commit? No.
This is why our Lord Jesus in the prayer He gave us to pray per Luke 11, we are to ask forgiveness of our sins, even after... we have believed on Him and been baptized. This also is John's Message in 1 John 1. We aren't to deny that we can still have sin in our lives, which is what Apostle Paul is teaching in Romans 7. Yet we are to repent when we do mess up, and ask Jesus forgiveness, staying in His grace.
To not recognize this basic Christian Doctrine from The New Testament is to go the way of lawlessness, and become an apostate.