Witness Lee wrote,
"Our organic union with the Lord is also in the Spirit. Christ and the Spirit are not two separate persons. They are one person. This is a divine mystery that is beyond human understanding. Christ is the Spirit (1 Cor. 15:45b; 2 Cor. 3:17)" (TOTG, 21).
TOTG - Lee, Witness, "The Organism of the Triune God in the Organic Union of His Divine Trinity," (Anaheim, CA: Living Stream Ministry, 1988).
Make note that 1 Cor. 15.45 does not say Jesus is the Spirit, but that the "last Adam a life giving [quickening] spirit". Notice spirit is not capitalized. And 2 Cor. 3.17 reads "Now the Lord is that Spirit", which is to say now the Lord is raised to the right hand of the Father, and the Holy Spirit has come down to indwell the believer. Jesus is in the believer by the Spirit while Jesus remains at the right hand of the Father.
Troy