How do we know that salvation is the work of God and not our own efforts?

Salvation is fundamentally the work of God, as the scriptures consistently affirm that human labor cannot earn righteousness or favor with God. This is highlighted in Ecclesiastes, where Solomon emphasizes the futility of our works under the sun. As we look at verses like Ephesians 2:8-9, it is clear that salvation is a gift from God, not a result of our works, so that no one may boast. This aligns with the Reformed doctrine of grace, which underscores that it is God alone who initiates and completes the work of salvation in us, demonstrating His sovereign grace.