How do we know salvation is completely of the Lord?

The doctrine of salvation by grace alone, as found throughout the Scriptures, underscores the idea that our salvation is not contingent upon human works or decisions, but rather is a sovereign act of God. In Romans 8:30, we see the golden chain of redemption where those whom God predestined, He also called, justified, and glorified. This demonstrates that our salvation is rooted in God's eternal plan and grace. Salvation is described in Ephesians 2:8-9 as a gift from God, not a result of works, so that no one may boast. If salvation were based on our actions or choices, it would no longer be by grace, negating the work of Christ and leading to despair rather than assurance.