How do we know that Christ will complete His work in us?

The assurance that Christ will complete His work in believers is a core aspect of Reformed theology and is firmly rooted in Scripture. Philippians 1:6 affirms this promise, stating that He who began a good work in you will carry it on to completion until the day of Christ Jesus. This reflects the sovereign grace of God in salvation; it is He who initiates the work of regeneration, which is not based on human effort but on divine purpose and grace. This belief emphasizes God's commitment to His people and His active role in their spiritual growth. It comforts believers with the knowledge that their struggles, failures, and growth are under the watchful eye of a loving and sovereign Savior, who guarantees their perseverance in faith.