The church is not merely the Body but also the one new man [Ephesians 2:15]….The Body has Christ as life, and the new man has Christ as a person….When anyone speaks, it is Christ who is the person….The result is that there is only one mouth [Romans 15:6].
How could all Christians speak the same thing?…The church is the one new man with only one person, and this person controls our speaking, so whatever He speaks is surely “the same thing” [1 Corinthians 1:10] that we all speak as the new man.
In the matter of speaking, is the Lord the person, or am I the person? If it is I, there will be a problem; if it is the Lord, there will be no problem. If I allow the Lord to be the person, He is the One who speaks; then two months later, if you allow the Lord to be the person, you will speak the same thing that I have spoken. (Witness Lee, One Body, One Spirit, and One New Man, ch. 5. Read more via, There’s Only One Mouth in the New Man)