Yet,
"Come to him, a living stone, though rejected by mortals yet chosen and precious in God’s sight, and 5 like living stones, let yourselves be built into a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ. For it stands in scripture:
'See, I am laying in Zion a stone, a cornerstone chosen and precious; and whoever believes in him will not be put to shame.'
To you then who believe, he is precious; but for those who do not believe, 'The stone that the builders rejected has become the very head of the corner,' and 'A stone that makes them stumble, and a rock that makes them fall.'
They stumble because they disobey the word, as they were destined to do. But you are a chosen race, a royal priesthood, a holy nation, God’s own people, in order that you may proclaim the mighty acts of him who called you out of darkness into his marvelous light.
Once you were not a people, but now you are God’s people; once you had not received mercy, but now you have received mercy." - 1 Peter 2:5-11
and
"John to the seven churches that are in Asia:
Grace to you and peace from him who is and who was and who is to come, and from the seven spirits who are before his throne, and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth.
To him who loves us and freed us from our sins by his blood, and made us to be a kingdom, priests serving his God and Father, to him be glory and dominion forever and ever. Amen." - Revelation 1:4-6
"They sing a new song:
'You are worthy to take the scroll and to open its seals, for you were slaughtered and by your blood you ransomed for God saints from every tribe and language and people and nation; you have made them to be a kingdom and priests serving our God, and they will reign on the earth.'" - Revleation 5:9-10
"But God, who is rich in mercy, out of the great love with which he loved us even when we were dead through our trespasses, made us alive together with Christ—by grace you have been saved— and raised us up with him and seated us with him in the heavenly places in Christ Jesus, so that in the ages to come he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus." - Ephesians 2:4-7
We aren't going to become kings at some future time, we are now kings and priests in Christ. We are seated, even now, with Christ in heavenly places; God has made us kings and priests, a royal priesthood.
The kingdom is not limited to the future Eschaton, the kingdom is here even now as Christ, the Lord, reigns as King of kings even at the right hand of the Father, in glory, until the day He comes and makes all things new. Both now and in the age to come, we are Christ's, and if Christ's, children of God; and if we are God's children by the adoption we have received by His mercy, then we are kings and priests.
But in God's kingdom what it means to be king means something very different than what it means to be king in this fallen world; for the royal power and authority of God does not look like a magisterial prince seated on a gilded throne arrayed in precious jewelry, instead the royal power and authority of God looks like a carpenter from Galilee nailed to a cross whom the powers that be said "was a glutton and a drunkard, a friend of sinners and tax collectors".
My King is a dirty peasant from Nazareth who spent His time with the poor, the lowly, with prostitutes, lepers, sinners, and the undesirable. For it is these for whom the kingdom of God is for; and it is for these that the banquet table is open, the garments made ready, and the feast of the ages offered.
"So Jesus called them and said to them, 'You know that among the Gentiles those whom they recognize as their rulers lord it over them, and their great ones are tyrants over them. But it is not so among you; but whoever wishes to become great among you must be your servant, and whoever wishes to be first among you must be slave of all. For the Son of Man came not to be served but to serve, and to give his life a ransom for many.'" - Mark 10:42-45
-CryptoLutheran