The first stage of His prayer in John 17 was for us to be kept in the oneness in the Father’s name, implying also in the Father’s divine life. In the second stage He prayed “Sanctify them in the truth; Your word is truth….That they all may be one; even as You, Father, are in Me and I in You, that they also may be in Us” (John 17:17, 21).
Externally, we are in the world as the early disciples were (17:18). Thus we need to be sanctified from the world all the way to the holy (sanctified) city of New Jerusalem.
To be sanctified (Eph. 5:26; 1 Thes. 5:23) is to be separated from the world and its usurpation unto God and His purpose, not only positionally (Matt. 23:17, 19) but also dispositionally (Rom. 6:19, 22). God’s living word works in the believers to separate them from anything worldly. This is to be sanctified in God’s word, which is the truth, the reality.*
Our oneness is not trivial. Christian oneness now, and in New Jerusalem, is “even as You, Father, are in Me and I in You.” This is realized through His prayer that “they also may be in Us.” Our oneness is our being in and living in the Triune God. Lord, we want to experience this!
Such oneness in the Triune God expresses the Triune God. Today the result is “that the world may believe that You have sent Me” (John 17:21). Ultimately the result is New Jerusalem shining with the glory of God to the whole universe.