Romans 7 is sandwiched between Romans 6 and Romans 8. Romans 6 carrying topics like, "Dead to Sin, Alive in Christ" and "Slaves to Righteousness". Romans 8 topics being "Life through the Spirit", "Present Suffering and Future Glory" and "More than Conquerers". This sandwiched chapter is in the middle of sections about sanctification of a believer and is the source of much debate- Pre-Christian verses Christian views, Adamic Nature or Christian struggle?
Martin Lloyd-Jones suggests that in his writing, Paul, is depicting a general struggle of what happens when someone tries to achieve holiness through the law rather than the Spirit. Augustin and Calvin would argue that Romans 7 depicts a believer caught in the tension of the now and not yet. John Piper, on his podcast 'Desiring God', addresses this debate and compares the writing in Romans 8 to Paul's writings in Galatians 5; " I don’t think Paul is saying the Christian lives under sin as a normal way of life — continually dominated and defeated by sin — but that in the moment of failure, sin gets the upper hand like a slave master temporarily getting control of a person who’s not really his. I think this because both in Romans 6:12 and Galatians 5:1 Paul warns Christians precisely not to submit again to the reign, or to the yoke, of slavery."
I would tend to agree with Piper and the those who believe that we are all in the state of becoming - until the Lord completes His good work in us at the time of the second coming. That the work being done in us to become more like Christ is a continual process, not a one and done thing. That temptations will continue to come are way and,with the help of the Holy Spirit, we an fight against them, but that we will never fulfill the law. If we could, we would have no need for Jesus.