The authority of God will endure forever.
Your kingdom is an everlasting kingdom, and your dominion endures through all generations. The LORD is faithful to all his promises and loving toward all he has made (Psalm 145:13).The Kingdom will not end, even when Christ returns. At that point Jesus will hand his Kingdom over to his father so that God might be all in all (1 Cor 15:28). He will rule forever and ever. His authority will never end.
God started his action on earth by placing people in a garden, with instructions to push out and fill the entire earth. Having completed the fulfilment of his Kingdom on earth, he will want to push out and fill the entire universe. Once the spiritual and physical realms are integrated, he will fill the universe with wonderful worlds and kingdoms. Those who have been faithful with little on earth, will work with him to fill the universe with his glory.
Kingdom Authority, p.174