How do we know the doctrine of salvation by grace is true?

Salvation by grace is rooted in the biblical narrative of God's sovereign election and redemptive work through Christ. In Ephesians 1:4-5, we see that believers were chosen before the foundation of the world. This shows that salvation is not based on human merit or actions but solely on God's grace. Romans 3:23 states that all have sinned and fall short of the glory of God, reinforcing the necessity of grace. Moreover, Hebrews 10:14 speaks of the perfecting of those who are sanctified by Christ’s one-time offering, underscoring the finality and sufficiency of His grace for salvation.