Peter Brandon discusses the struggle every believer faces with sin, as illustrated in Romans 7, emphasizing the conflict between the flesh and the spirit. He explains that the 'body of death' represents the sinful nature that clings to us, much like a corpse, and highlights the importance of recognizing this conflict to achieve victory over sin. Brandon shares personal experiences and encourages believers to acknowledge their struggles, as this conflict is a sign of salvation and the work of the Holy Spirit. He emphasizes that true victory comes not from willpower but through the Spirit, urging believers to mortify the flesh and live according to the Spirit's guidance.