How do we know that salvation is solely through grace?

We know that salvation is solely through grace because the Scriptures make it unmistakably clear that it is not of ourselves but a gift from God (Ephesians 2:8-9). The Father's choice, the Son's redemption, and the Holy Spirit's regeneration signify that salvation is wholly the work of God. Paul affirms this in Galatians, where he highlights that one cannot add works to grace without nullifying it (Galatians 2:21). This doctrinal foundation leads believers to rejoice in God's sovereign grace, underscoring the truth that we contribute nothing to our salvation.