We are not only members of the Church, but also of the Kingdom of God. When Jesus came, He told us that the Kingdom of God was at hand, upon us, and is coming. If He made so many references to the Kingdom of God, it is then our responsibility to learn how to live in the Kingdom of God. It is the only way we can prosper and live in victory; for the Scriptures say that our citizenship is in heaven (Philippians 3:20). In this publication, we will explore five foundational concepts concerning the Christian life as citizens of God's kingdom. In understanding these concepts, one will live a successful life on the Christian journey.