How do we know that God saves believers by grace?

Ephesians 2:8-9 articulates the heart of sovereign grace theology, stating that salvation is fundamentally a gift from God: 'For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.' This doctrine assures us that our salvation is entirely dependent on God's grace and not on our merit or actions. Throughout Scripture, we find evidence of God’s sovereign grace in His choice of individuals for salvation, underscoring that it is God's will and purpose that prevails in the process of redemption (Romans 9:15-16). Believing in total depravity and unconditional election further solidifies the belief that it is God's loving initiative alone that brings sinners to Himself.