Grace is not only the divine act by which God initiates our spiritual life, but also the very power by which we are sustained in, nourished, and proceeds through that life. The energizing and sanctifying work of the indwelling Spirit is the grace of God. After Paul had prayed three times for God to deliver him from his thorn in the flesh, he received this answer: "My grace is sufficient for you, for My power is made perfect in weakness" (2 Cor. 12:9). Although Paul undoubtedly derived encouragement and strength to face his daily trials by reflecting on the magnificence of God’s unmerited favor, in this text he appears to speak rather of an experiential reality of a more dynamic nature. It is the operative power of the indwelling Spirit to which Paul refers. That is the grace of God.