How do we know that salvation is through grace alone?

The doctrine of salvation by grace alone is deeply rooted in Scripture, as seen in passages like Ephesians 2:8-9, which declares that we are saved by grace through faith, and this not of ourselves; it is the gift of God, not of works, lest anyone should boast. This illustrates that human effort or righteousness has no part in salvation. The assembly of God's people in the temple, as depicted in 1 Kings 8, highlights that salvation is God's work from beginning to end, designed for those who, in their wretchedness, are entirely dependent on His mercy. Throughout Scripture, we see that grace is unmerited favor; God elects and redeems His people purely out of His good pleasure and love, removing room for human boasting.