God cares for our bodies and wants to bring life to them. Paul, the author of Romans 8, contrasts the realm of the flesh with the realm of the flesh. The believer lives by the realm of the spirit. Living according to the flesh leads to death. Life according to the spirit brings resurrection power and the promise of healing. So, the believer puts into practice the ongoing work of putting our sin to death by the power of the Holy Spirit at work within.