The central message of this sermon is that our true life and identity come solely from Jesus Christ, and everything else in Christianity revolves around Him. The speaker emphasizes that our relationship with God the Holy Spirit is ultimately a relationship with Jesus, who is our initial paraclete (helper, comforter, guide, teacher, and friend). Our life in eternity past, history past, and present moment all depend on Jesus' death, resurrection, and ongoing life within us. The speaker argues that we are not saved by Jesus' death alone, but by his death and resurrection together, which gives us access to eternal life through faith in Him. Ultimately, the sermon concludes that our purpose is to be witnesses of Christ's life and character, waiting for His return so that we can be with Him and become like Him.