Why is the doctrine of grace significant in Christianity?

The doctrine of grace is at the heart of the Gospel, affirming that salvation is a gift from God, not something earned by human effort. Ephesians 2:8-9 makes clear that it is by grace we are saved, through faith, and this is not of ourselves. Grace assures us that God’s love and acceptance do not hinge on our performance, which gives believers hope and rest in Christ’s finished work. This sovereign grace is what sets true Christianity apart, as it guarantees that salvation is secure and fully accomplished in Christ's sacrifice.