And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
All Commentaries on Romans 8:10 Go To Romans 8
John Chrysostom
AD 407
Paul is not saying here that the Spirit is Christ but is showing rather that anyone who has the Spirit has Christ as well. For where the Spirit is, there Christ is also. Wherever one person of the Trinity is present, the whole Trinity is present too. For the Trinity is undivided and has a perfect unity in itself.