Why is the process of sanctification important for Christians?

Sanctification is an essential aspect of the Christian experience, where believers are progressively conformed to the image of Christ through the work of the Holy Spirit. This process is rooted in the fact that through grace, not only are we justified before God, but we are also called to grow in holiness. As Paul states in Philippians 1:6, God, who began a good work in us, will carry it to completion. Sanctification serves to demonstrate the realities of our salvation; it reflects the transformative power of grace operating within us. It reinforces the believer's assurance that they have been truly reconciled with God and are part of His redemptive plan, ultimately leading to glorification.