Before we were justified freely by the grace of God, we were slaves to sin and subject to its demands. However, through the sanctifying and sustaining power of the Holy Spirit, who indwells us, we are no longer slaves to sin, and we can now walk in newness of life. Yet, walking in newness of life can only be accomplished practically speaking by recognizing that our old self was crucified with Christ and that we are to reckon ourselves dead to sin and alive unto God.