How do we know salvation is through God's grace?

The concept of salvation in the historic Reformed tradition is firmly grounded in the doctrine of grace. Ephesians 2:8-9 articulates this beautifully: 'For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.' Salvation is an act of God’s unmerited favor toward sinners, achieved through the life, death, and resurrection of Jesus Christ. It is God alone who regenerates the heart, grants faith, and assures us of our salvation, meaning it is not based on human effort but entirely on His grace and mercy.