The sermon explores the dual aspects of Christian identity through Paul's declaration in Acts 27, focusing on belonging to God and serving Him. It contrasts natural spiritual alienation with the redeemed status achieved solely by Christ's sacrificial grace. The preacher emphasizes that true faith involves a personal, bold, and constant profession of trust in Jesus for forgiveness. This salvation leads to a life of devoted service, where believers offer themselves as living sacrifices to glorify God. Ultimately, the message calls listeners to examine their own hearts and affirm their secure position as God's possession.