That God Might Gather Together In One All Things In Christ
The following is in response to you asking:
Please help me understand Eph.1:10. How can the re-birthed with new bodies fashioned like unto Christ's glorious body, fitted for ruling and reigning in the heavenlies, be gathered together in one with the Jew and Gentile living on planet earth?
There are a few details to answer based on the verse you reference.