How do we know that God's people are called out of darkness?

In 1 Peter 2:9, being called out of darkness into God's marvelous light speaks to the profound transformation that occurs in the lives of believers. This change illustrates the transition from spiritual blindness and sin to awareness, acceptance, and joy in the truth of the Gospel. This transformation is not merely a change in behavior but signifies a new identity in Christ, where individuals who once had no relationship with God are now heirs to His promises, reflecting His light in a dark world. The metaphor of darkness to light emphasizes the grace and mercy of God, showcasing that the calling of His people arises from His initiative to reveal His love and redeem them from their sinful conditions (John 8:12).