And so in my mind the 4 verses below fit perfectly. Every single person I know has told me about Romans 7 when I tell them I do not believe Paul taught about a "sin nature" for the Christian. What Paul talks about in the seventh chapter of Romans is what occurs to the believer who still thinks the Law applies to them. They end up spiritually dying by the commandment and realize that the commandment does not produce life. The war is with their flesh because they are still believing the Law has power over them. In the eighth chapter of Romans is where it explains how we overcome this whole issue by living in the spirit and being dead to the Law. We cannot live by faith in what Christ has done for us and still think our obedience to written laws are necessary. To do so takes away from the perfect work of Christ and places salvation and righteousness back in our own hands.
Romans 6:2
How shall we, that are dead to sin, live any longer therein?
Romans 6:6
Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin.
Galatians 5:16,18
This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
But if ye be led of the Spirit, ye are not under the law.