What does the Bible say about good works in believers?

In Philippians 1:6, Paul expresses confidence that the same God who began a good work in believers will carry it on to completion until the day of Christ Jesus. This emphasizes that the good work is initiated by God and sustained by His power, assuring believers of His continuous involvement in their spiritual growth and perseverance. The good work in believers reflects God's promises and His grace, as it transforms them into a fellowship of saints through faith in Jesus Christ.

Moreover, this good work encompasses the process of regeneration, where individuals are born of God and called to believe in Christ Jesus. As they respond to the gospel, they partake in fellowship with others who have also experienced this transformation. Importantly, this good work highlights that it is not our efforts that sustain our faith and good deeds, but the active work of God within us, illustrating the Reformed understanding of divine sovereignty in salvation.