In this Sunday School lesson, we look at Gal. 5:16, which provides one of the most important commands in the Word of God, that enables the Christian to accomplish the will of God. First we define what walking in the Spirit is. Then, we explain how to obey the command to walk in the Spirit. Finally, we look at how important it is for the Christian to obey this command to walk in the Spirit, in order to live the victorious Christian life.