How do we know salvation is entirely from God?

The Bible clearly states that salvation is completely of the Lord. In Ephesians 2:8-9, it says we are saved by grace through faith, and that not of ourselves; it is the gift of God, not of works, lest anyone should boast. This demonstrates that God's grace, not our merit, is the foundation of our salvation. Furthermore, Romans 9:16 includes that salvation is not of him who wills or runs, but of God who shows mercy. Thus, every aspect of salvation—from the plan to the execution—is divinely orchestrated.