Why is sanctification by God important for Christians?

Sanctification is a core aspect of the Christian faith, reflecting the transformative work of God in the life of a believer. It denotes that God has set believers apart from the world, making them holy and preparing them for His purposes. Ephesians 1:4 teaches that believers were chosen in Christ before the foundation of the world to be holy and blameless. This sanctification is not an ongoing process of self-improvement but is established through God's sovereign and decisive action in the lives of His people, ensuring their identity and role as His children.