In this exposition of Romans 8:9-11, we examine the critical difference between those who are in the flesh and those who are in the Spirit. Paul shows that the true mark of belonging to Christ is the indwelling of the Holy Spirit, who dethrones the flesh and brings life and peace. We are challenged to ask: Does the Spirit of God dwell in me? And to find our assurance not in outward appearances, but in the presence and rule of the Spirit in our hearts.