1 Pet 2:9

2:9 But you. This marks a sharp contrast between the destiny of unbelievers (v. 8) and the status of the elect. The theme of God’s sovereign choice of both Christ and the church is prominent in this passage (vv. 6, 9).

that you may proclaim. The election and calling of God’s people is not only for salvation but for service as well. All believers are called to bear joyful witness to the saving acts of God.