What is the context?
The contrast with disobedience now becomes a description of the readers’ calling: a chosen people, royal priesthood, holy nation and God’s own possession. These titles are joined with a purpose—to proclaim the virtues of the One who called them into His light.
The language recalls Exodus 19:4–6 and Isaiah 43:20–21. Peter draws on God’s earlier descriptions of His people to explain the dignity and responsibility of those who belong to Christ.
The movement from no people to God’s people, and from no mercy to mercy, recalls Hosea 2:23. Their identity rests in mercy received, giving them reason to declare God’s goodness.
How is this passage commonly understood?
Calvin and Wesley both understand the priesthood as belonging to the believing people and the proclamation as extending through their conduct as well as their words.
Traditions differ over distinct ordained ministry within that people. The Catholic Catechism, 1546–1547, affirms the whole community’s priesthood and also an ordained priesthood serving it through participation in Christ’s one priesthood. The Reformed Westminster Confession, 27.4, assigns administering baptism and the Lord’s Supper to ordained ministers. The shared calling is not the same question as who carries out every particular task.
Where does this fit in God's plan?
God’s call at Exodus 19:4–6 follows His deliverance of Israel and gives that people a vocation before Him. Isaiah 43:20–21 likewise connects the people He forms with declaring His praise.
Romans 9:24–26 also applies Hosea’s people-and-mercy language in speaking of those called from Jews and Gentiles. The connection shows the breadth of God’s mercy as He brings people into a shared life before Him.
What is our position?
Our study Returning to the Word identifies the church as the people in whom God’s Spirit dwells and the priesthood as a calling shared by every believer. Who Shepherds the Church? connects that shared life with direct access to God through Christ, without a necessary human mediating class between Him and His people.