The sermon presents a comprehensive biblical understanding of the heart as the integrated center of intellect, emotion, and will—essential for genuine salvation. It emphasizes that true faith involves more than intellectual assent or emotional response; it requires the whole person to engage with gospel truth, respond with conviction, and make a deliberate choice to trust Christ. Drawing from Romans 10, it argues that salvation is not achieved through human effort or religious performance, but through heartfelt belief in Christ's death, burial, and resurrection, followed by verbal confession. The sermon warns against superficial faith, stressing that without the full engagement of mind, emotion, and will, belief remains ineffective and potentially deceptive. Ultimately, it calls listeners to examine their hearts, recognize the danger of spiritual complacency, and make a decisive, informed commitment to Christ, grounded in Scripture and empowered by the Holy Spirit.