John 14:17 note 2
172 The very "He" who is the Spirit of reality in this verse becomes the very "I" who is the Lord Himself in v. 18. This means that the Christ who was in the flesh went through death and resurrection to become the life-giving Spirit, the pneumatic Christ. First Corinthians 15:45 confirms this. In dealing with the matter of resurrection, that verse says, "The last Adam [Christ in the flesh] became a life-giving Spirit."