Why does Peter emphasize our calling to proclaim God's virtues?

In 1 Peter 2:9, it states, 'that you may proclaim the praises of Him who called you out of darkness into His marvelous light.' This calling is significant as it reinforces the purpose of our identity as God's people. Christians are called not just for their own benefit but to actively testify of God's goodness and salvation, thus glorifying Him. This exhortation serves as a reminder that our lives should be reflective of God's grace, showcasing His mercy and love to those around us, strengthening our witness in a world blinded by darkness.