The last, grandest, highest motive behind everything... The be-all-end-all of existence... Of the entire creation... What is it?
It should include the reasons for everything. It should be self contained while containing everything else in it. Nothing should exist or could exist outside of this box. If it did, we would have to continue our search for that one unified theory of everything.
"When all things are subjected to him, then the Son himself will also be subjected to him who put all things in subjection under him, that God may be all in all." (1 Corinthians 15:28)
Resurrection is the subject of 1 Corinthians 15. Although it will be a big deal for those who will be resurrected, it is not the underlying theme of the chapter, nor does it qualify for “ultimate end” status. There is yet a higher motive in play, a force so perfect and compelling, nothing deters or delays its coming to pass. You might even say that the Gospel itself is subservient to it... a means to a higher end.
“…that God may be all in all.”
There it is: the backdrop and the essential reason for the resurrection, retrieval and submission of all things to Himself again. Everything results in the glory of God. He SHALL be glorified.
This is not a hidden truth. I am not expressing anything new. Yet, it tends to be a truth that gets buried in our myopic, quotidian experience.
We project our thoughts to a national level (we think ours is number one). At times we think on a planetary level (ecological sanity is not an option, it is about survival). Sometimes we try to wrap our minds around the idea of cosmos and origins (big bang or creation?). But… when we add up everything that we can possibly think about, we need to remember:
"The LORD is high above all nations, and his glory above the heavens!" (Psalms 113:4)