The ground of the church is directly related to the importance of the church. Certain portions of the Word such as Matthew, Ephesians, and Revelation reveal the importance of the church. In this book Witness Lee considers the importance of the church as shown in these books. Then he goes on to consider the inward and outward aspects of the church as well as the oneness manifested in the four great acts of God. This oneness is the genuine ground of the church.