How do we know salvation is from God?

The Bible clearly affirms that salvation is a sovereign act of God, not based on human effort or decision. David's cry in Psalm 28, 'Save thy people,' reflects the understanding that God alone can accomplish salvation. Ephesians 2 further elucidates that we are saved by grace through faith, and this not of ourselves; it is the gift of God. This underscores the truth that God's purpose in salvation is fulfilled solely through His Son, Jesus Christ, who came to save His people from their sins. Therefore, we can know with certainty that salvation is not within our power but is entirely dependent on God's sovereign will and action.