Our regenerated spirit indwelt by the Spirit, who is the focus of God's promised blessing stressed so much throughout this book. It is in this spirit of ours that we experience and enjoy the Spirit as the central blessing of the New Testament. Hence, we need the grace of the Lord, which is the bountiful supply of the all-inclusive Spirit (Phil. 1:19), to be with our spirit.
Christ, the Spirit, the new creation, and our spirit are the four basic items revealed in this book as the underlying thought of God's economy. Christ is the center of God's economy, and the Spirit is the reality of Christ. When Christ is realized through the Spirit in our spirit, we become the new creation. Hence, our spirit is vital for us to live the life of the new creation for the fulfilling of God's purpose.
This book places strong emphasis on the cross and the experience of crucifixion, in order to deal with the negative items, such as the law, the flesh, the "I," the religious world, slavery, and the curse, thereby bringing in the positive items that are revealed in this book: Christ, the Spirit, the sons of God, the heirs of promise, the household of the faith, the new creation, and the Israel of God. The summarizing thought in this book is that through the cross of Christ the law, the flesh, and religion are terminated that we may obtain the Spirit, the new creation, and our spirit, that through the Spirit, who is the realization of Christ, we may be the new creation in our spirit, bearing the brands of Jesus, and that we may enjoy the grace of the Lord Jesus Christ in our spirit.