How do we know that salvation is a work of God alone?

The doctrine of salvation underscores that it is entirely God's work. In John 6:29, Jesus affirms this by stating that the work of God is to believe on Him whom He has sent. This highlights that faith itself is a gift from God, not a result of human effort. Likewise, Ephesians 2:8-9 asserts that we are saved by grace through faith, and that this is not of ourselves, it is the gift of God, not of works, lest anyone should boast. Therefore, the assurance that our salvation is secure rests in God's sovereign grace, not our own actions.