How do we know salvation is about grace?

Noah's selection by God for salvation amidst a sinful world illustrates the doctrine of sovereign grace. Genesis 6:8 reveals that Noah found grace in the eyes of the Lord, a connection to the New Testament theme where salvation is a gift from God, not earned by works. This reinforces the Reformed view that God's grace is unmerited and sovereignly bestowed upon those He chooses, reflecting Ephesians 2:8-9, which emphasizes that we are saved by grace through faith, not by our own efforts, differentiating God's saving work from human merit.