Does 2Corinthians 3:17 contradict the Trinity because it proves Jesus is the Holy Spirit? What's the best way, contextually, to interpret this verse? Different Bible exegetes have disagreed on this verse and it is an ambiguous verse. The verse doesn't specifically say "the Lord Jesus is the Holy Spirit" (in fact 'Holy Spirit' doesn't occur anywhere in the chapter) and it's important to study the unambiguous verses on the relationship between the Holy Spirit and Christ.

I highly doubt Paul is randomly saying Jesus is identical to the Holy Spirit in passing with no elaboration. If the Holy Spirit is eternal (Hebrews 9:14, Gen. 1:2), then this would actually contradict Unitarianism and Modalism since they both teach the Son is a created being on earth. Paul consistently teaches the distinction between the Son and the Spirit.

The teaching that the Holy Spirit is both the Spirit of the Father and Son (Rom. 8:9, Gal. 4:6, John 14:23, Acts 16:6-7) actually supports the Trinity since it emphasizes the Father and Son are coequally the same Being: YHWH (Isaiah 61:1). A divine Being and a human being cannot share the very same Spirit.

"The Holy Spirit is the Spirit of Christ and God":
https://www.youtube.com/watch?v=5wgaAkKbwds