How do we know that salvation comes solely by grace?

The doctrine of salvation by grace alone is foundational in Reformed theology, as encapsulated in the Five Solas. Ephesians 2:8-9 proclaims that it is by grace we are saved through faith, not by works, so that no one can boast. Scripture teaches that our own righteousness is insufficient for standing before a holy God; thus, grace becomes the sole means of salvation. This grace removes any grounds for human pride or merit, highlighting instead that the salvation we receive through Christ is a complete work of God. Furthermore, 2 Timothy 1:9 affirms that God saved us and called us according to His purpose and grace, reinforcing that our salvation is entirely His initiative.