What is the thousand-year reign compared to in relation to the eternal state?
The thousand-year reign is an introduction to eternity rather than the end of time. It is an elementary phase giving a limited view of the eternal state, where we will rule and reign with Christ over the heavenlies in new heavens and a new earth.
Les explains that the thousand-year reign does not just end time as we know it; it is an introduction of eternity. He calls it an elementary phase that gives only a limited view, yet it reveals the eternal state of our ruling and reigning with Christ over the heavenlies. The context also points to new heavens and a new earth, and to His everlasting dominion and kingdom that shall not be destroyed.