If the believer walks in the Spirit and not the flesh, then why does the believer still sin? Pastor Murphy will show us that the although the believer's spirit is life (because of the righteousness of Christ), the body is dead to God (because of the implanted sinful nature). The sin nature is not eradicated at salvation; the believer must still conquer the sinful things that the flesh wants him to do. Only in the future, will the believer's body be redeemed.