What does the Bible say about the believer's inner struggle?

In Romans 7, Paul elucidates the inner struggle that every true believer experiences, which results from the conflict between the desires of the flesh and the leading of the Holy Spirit. This is not merely a struggle of conscience that any individual may face, but a profound warfare that exists specifically because believers have been regenerated by the Holy Spirit. The apostle states, 'For I delight in the law of God after the inward man' (Romans 7:22), indicating that true believers find joy and purpose in aligning themselves with God's moral law, which is fulfilled by Christ. However, they also encounter the opposing force of their sinful nature, or flesh, which seeks to lead them away from that delight.