ISB ~ 1 Peter 2 v9

But you:Contrasts believers in Christ with those who reject the Messiah (2:8). The rest of the verse is a patchwork of expressions drawn from the Greek OT.

• Two come from Is 43:20-21, where Israel is the chosen race commissioned by Yahweh to declare his wonderful deeds to the nations. Another comes from Mal 3:17, where the faithful of Israel are called God’s own special people. Two more come from Ex 19:6, where Israel is gathered at Sinai and consecrated as a royal priesthood and a holy nation. These titles and privileges, once the exclusive prerogative of Israel, are now extended to the whole messianic people, who have come to share in the blessings of a covenant relationship with God (Rom 11:17-24; 15:27). One responsibility entailed in this relationship is the missionary vocation to announce God’s goodness and salvation to the world.

• Here we learn of the “priesthood of all believers”, the doctrine that Baptism makes every member of the Church a sharer in the priesthood of Christ (CCC 1268, 1546). This grace, which differs in kind and not merely degree from the grace of ministerial priesthood possessed by bishops and priests, enables every Christian to minister to the spiritual needs of others (1 Pet 4:10) and to offer sacrifices of love and praise to God in his daily life (2:5; Rom 12:1; Heb 13:15-16).