Rom. 8:9 But you are not in the flesh; you are in the Spirit, since the Spirit of God dwells in you. Anyone who does not have the Spirit of Christ does not belong to him. 10 But if Christ is in you, though the body is dead because of sin, the Spirit is life because of righteousness. 11 If the Spirit of him who raised Jesus from the dead dwells in you, he who raised Christ from the dead will give life to your mortal bodies also through his Spirit that dwells in you.
Paul often talked about the contrast of life in the Spirit vs. life in the flesh. For him, life in the flesh was the old life that was governed by the law; it was the place where the physical body and it’s desires won over on a daily basis. He knew that transformation came when someone was united with Christ.
There is no separation of the Trinity, and therefore for one to be united with Christ is to be in fellowship with the Triune God. The Spirit becomes the guiding force of life. While the law brou…