In Romans 7, Paul is talking from his experience (or perspective) when he was a law abiding Jew before he became a Christian. We know this because in Romans 7:14, he says he is sold under sin and then at the end of Romans 7, when he points out Jesus Christ, Paul then states in Romans 8:2 that he is free from sin. In other words, if you believe Paul is speaking from the same perspective in both Romans 7 and 8, there would be a contradiction.
Side Note:
Now, do not misunderstand me. The Law or the Law of Moses is not the same thing as the Law of Christ (Galatians 6:2) or the Law of the Spirit of life in Christ Jesus (Romans 8:2). James calls it the royal law. Paul says that what he had written should be considered as the Lord's Commandments.
The Law of Moses is of the Old Testament and it is no longer binding.
The Law of Christ is of the New Testament and it was put into effect with Christ's death.
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