But you are a chosen generation, a royal priesthood, a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light; (1 Peter 2:9, NKJV)
Peter has developed the point that Christians are “a holy priesthood” because Christ is the chief cornerstone of the house of God, the church (1 Peter 2:4-6). In this summary passage, he says our priesthood is royal or regal. Because we are citizens of the kingdom of God, we share in the blessings granted by the King (Jesus), who has “made us kings (a kingdom) and priests to His God and Father” (Revelation 1:6). Just as priests serve in a temple, Christians compose the temple of God – the church – and serve God in it (Ephesians 2:19-22). (This shows the importance and value God places on the church.) We are privileged to offer up spiritual sacrifices to God which are acceptable through Jesus Christ (1 Peter 2:5). Therefore, our sacrifices and service to God must agree with His will since we are “priests to our God” (Revelation 5:10). The church does not decide what is acceptable service to God. God has done that, and revealed it to us in His word. It is up to us to offer Him the priestly service He expects and deserves (Romans 12:1-2).