How do we know God's promises of salvation are true?

In the sermon, it is highlighted that God's faithfulness is historically demonstrated in His deliverance of the Israelites from Egypt and His ongoing commitment to His people. Scripture reveals that God's plan for salvation is consistent with His character; He does not contradict Himself. The culmination of these promises is found in Jesus Christ, referred to as the Angel of the Lord in the Old Testament, who ultimately fulfills God's redemptive purpose. This assurance in God's promises provides a firm foundation for faith in both present and future circumstances.