How do we know salvation is secure under Christ's reign?

The assurance of salvation hinges on the sovereign reign of Christ. As stated in Matthew 1:21, He shall save His people from their sins, indicating that His redemptive work is certain and effective. This reinforces the doctrine of unconditional election, where believers rest in the confidence that their salvation is not contingent upon their actions but rather His unchanging decree. The King operates with absolute authority and power, ensuring that nothing can thwart His purpose, and even the gates of hell cannot prevail against His Church (Matthew 16:18).