How do we know that salvation is a work of God's grace?

The assurance of salvation as a work of God's grace is firmly rooted in the doctrines presented throughout the Bible. Ephesians 1:4-5 highlights that believers are chosen by God according to His will. This emphasizes the initiative of God in salvation. Christ’s accomplished work on the cross is sufficient and effective for the elect, which is also affirmed in Romans 8:28-30, where those He predestined and called are guaranteed to be justified and glorified. It's through His sovereign grace that individuals are regenerated and brought to a saving knowledge of Christ.