In The End

The native Nerthusian, Joe, thinks that:

"'...on the last day my gods will speak louder.'"

-Poul Anderson, "The Green Thumb" IN Anderson, The Complete Psychotechnic League, Volume 3 (Riverdale NY, July 2018), pp. 21-41 AT p. 28.

What last day?

Old Kormt says of Earth:

"'Man came from here; and to this, in the end, he must return.'"

-"The Chapter Ends," p. 196.

What end?

There is an "...in the end..." prophecy in "Star of the Sea" but my copy of Time Patrol is inaccessible at present and that is in a different context in any case.

Poul Anderson is echoing Biblical language. Joe and Kormt each think/believe/hope/project/whatever that their perspective will somehow prove more valid/durable/etc than any other but it is hard to see how this can have any concrete meaning except inside their own heads. 

Earth and the Nerthusian gods are indeed aspects of the single reality.