I Peter 2:9,10
Just as Jesus was rejected by men but chosen by God, so also Christians – though ‘nobodies’ in the world’s eyes – have been chosen by God and are special to Him. This is the one thing that all Christians, despite our very diverse backgrounds, have in common; it is what gives us our identity. Like the nation of Israel, we are “a chosen people.” (Deuteronomy 7:6) And all that Israel should have been, the Church now is: “a royal priesthood” or “a kingdom of priests” (Exodus 19:5,6).
We Gentiles had been excluded from the Old Covenant; but although we were ‘in darkness’, we were never beneath God’s notice or beyond the reach of His love (Colossians 1:12,13). His grace has now transformed us from ‘non-people’ into His very own children (Hosea 2:23). And this is not because of any merit or right of our own, but purely because of God’s incredible love and compassion for undeserving sinners.
And so there is no such thing as an ‘ordinary’ Christian; every one of us (Jewish or Gentile) is a priest, with direct personal access to God, and therefore able to mediate between Him and unbelievers.