The Lord wants the believers to have a living that is a mutual abiding in spirit: the believers abiding in the Lord and the Lord abiding in their spirit. Man has a human spirit for him to receive God as life, but the believers must be diligent to exercise their spirit to live by the Lord for the church life. In A Living of Mutual Abiding with the Lord, Witness Lee shows that living with the Lord in the way of mutuality is the central revelation of the Bible. For this the Lord Jesus went through a process: He became flesh, a man, to be our Redeemer; and He became the life-giving Spirit to be our Savior in life. The Lord first comes into us and then He abides in us. This mutual abiding is altogether in the one spirit. "He who is joined to the Lord is one spirit" (1 Cor. 6:17). Christ as the life-giving Spirit comes into our human spirit for us to be one mingled spirit, and this makes possible the living of the highest Christian life, a mutual abiding with the Lord.