What does Romans 8:11 mean?
Paul wrote in the previous verse that Christians are spiritually alive, because of God's Spirit with us, but that our physical bodies are dying and will die because of sin (Romans 5:12).Now, though, Paul assures his Christian readers that their physical bodies will be resurrected, as Christ's was (1 Thessalonians 4:16). More specifically, he says that "if"—which in this context means "since"—God's Spirit is in you, that same Spirit that raised Christ from the dead will also give life to our mortal bodies (1 John 3:2).
Paul is clear: Resurrection is a work of the Holy Spirit of God. That's one of the things He does. He raised Jesus from the dead, and He will do the same for all who are in Christ when the time comes. This continues the theme from this passage: that those who are saved, in Christ, are absolutely and totally free from any threat of condemnation.