Major Ian Thomas emphasizes that the law was unable to provide salvation, as it merely highlighted humanity's sinfulness and need for redemption. He explains that God's covenant with Abraham foreshadowed the coming of Christ, who fulfilled the law's requirements through His sacrificial death and resurrection. The sermon illustrates that salvation is not about adhering to the law but about receiving the life of Christ through faith, which brings about regeneration and a new relationship with God. Thomas encourages believers to rely on the Holy Spirit for strength and guidance, rather than attempting to achieve righteousness through their own efforts.