How do we know that we are saved by grace alone?

The doctrine of salvation by grace alone hinges on the understanding that we, as sinners, cannot attain righteousness through our works. Ephesians 2:8-9 clearly articulates that salvation is a gift, not the result of human effort, emphasizing that it is by grace through faith that we are saved. This grace is rooted in the merits of Christ's blood and righteousness, demonstrating that Jesus' sacrifice fulfills the demands of justice and secures our salvation. Hence, the assurance of salvation lies solely in the unmerited favor of God, emphasizing that all believers are called to rest in Christ's completed work.