How do we know that salvation comes from God's grace?

Ephesians 2:8 clearly teaches that salvation is by grace through faith, indicating that it is entirely a gift from God rather than something we can achieve through our works. This doctrine of sovereign grace emphasizes that God chooses individuals for salvation based on His own will and purpose, not on their merit. Throughout Scripture, we see that it is God who initiates and completes the work of salvation in us (Philippians 1:6), ensuring that our faith is rooted in Christ alone, who provides the fullness of salvation as our righteous substitute.