God is building Himself not in Himself but in man, and not only in man but also into man. This building is God’s constituting of Himself in Christ into man [Acts 9:15]. God in Christ is constituting Himself into man, making Himself the element of man….This means that a divine element is built into our human element, and the two elements are mingled with each other. Not only is God’s divine element constituted into us—the human element is constituted into God. As the divine element is constituted into our humanity, we become God in life and in nature but not in the Godhead. As the human element is constituted into God, God becomes man. This is the building revealed in the New Testament.
Such a revelation should become a principle that governs our understanding of God and of God’s building. When we talk about the building up of the church or about the building up of the Body, we need to realize that this building is a constitution of the divine element into the human element and of the human element into the divine element. This building, therefore, is a constitution of the divine element and of the human element into each other. Such a constitution makes the divine element and the human element one entity. This is the building of the church, the building of the Body of Christ. (Witness Lee, Life-Study of 1 & 2 Samuel, ch. 31)