What does the Bible say about God's work in believers?

Philippians 1:6 declares with assurance that the God who initiates a good work in believers will see it through to completion. This theological truth underlines the sovereignty of God in the process of salvation, affirming that it is God who initiates, sustains, and finalizes the work of grace within the hearts of His elect. It removes the uncertainty surrounding our salvation, assuring believers that they are preserved and being perfected until the return of Christ, where their transformation will be fully realized.