Per the Nicene Creed:
And his kingdom will have no end
Per the Holy Bible:
Your kingdom is an everlasting kingdom. You rule throughout all generations.
I tell you the truth, anyone who believes has eternal life.
What I am saying, dear brothers and sisters, is that our physical bodies cannot inherit the Kingdom of God. These dying bodies cannot inherit what will last forever.
Then the seventh angel blew his trumpet, and there were loud voices shouting in heaven: “The world has now become the Kingdom of our Lord and of his Christ, and he will reign forever and ever.”
* * * * * * *
Truth is...as I've said before, eternity is a concept that my human brain can't quite get a grip on. But if God's rule is a perfect rule, and his kingdom is literally heaven on earth, then it makes sense that it would never come to an end.
Lead on, oh King eternal...