This introduction indicates the great importance of a good grasp of the kingdom of God—it is indispensable for a proper understanding of Jesus Christ and the redemption he accomplished. A good understanding of the kingdom illuminates many other aspects of theology. The introduction also reflects on divergent views of the kingdom.

This is a book about the unity of the church of Christ, and chapter 1 is a short theology of the unity of the church. This unity is a demonstration of God’s purpose of cosmic unity. The church further displays the unity and uniqueness of God. The gift of unity is on the one hand a mark of the church and on the other hand to be pursued without ceasing.