The Royal Priesthood and the Nations

Perhaps we have not given much thought to the training that must be given to each member of the Royal Priesthood if he or she is to serve God successfully in the role of a governing priest. Each of us Christians, if he is to serve as a member of the Royal Priesthood, will have to experience long, thorough training if he is to fulfill his role properly throughout the coming ages.
The basic design of the Kingdom of God is easy to understand, but it appears it is not preached very often. The Kingdom of God is in two primary parts: the Royal Priesthood, of which the Lord Jesus Christ is the High Priest. Then the multitude of saved people who are the inheritance of the elect and whom God will save into the new world of righteousness.
But you are a chosen people, a royal priesthood, a holy nation, a people belonging to God, that you may declare the praises of him who called you out of darkness into his wonderful light. (I Peter 3:9—NIV)
It is impossible to understand the Kingdom of God unless one realizes that the Christian Church, which is the Royal Priesthood, has been called out of the world to govern and bless the multitudes of saved mankind.
There will be no more night. They will not need the light of a lamp or the light of the sun, for the Lord God will give them light. And they will reign for ever and ever. (Revelation 22:5—NIV)
Many passages of the Old Testament refer to the rule of God's saints over the saved peoples of the earth. The saints are neither Jewish nor Gentile as such. Rather, they are the members of Christ's Church, whether Jewish or Gentile by natural birth.