Where are these other things?

From J.R.R. Tolkien’s story “Athrabeth Finrod ah Andreth” (unpublished within his lifetime, see more here):

“But do you know that the Eldar say of Men that they look at no thing for itself; that if they study it, it is to discover something else; that if they love it, it is only (so it seems) because it reminds them of some other clearer thing? Yet with what is this comparison? Where are these other things?”

“We are both Elves and Men, in Arda and of Arda; and such knowledge as Men have is derived from Arda (or so it would appear). Whence then comes this memory that ye have with you, even before ye begin to learn?”

***

“Ever more you amaze my thought, Andreth,” said Finrod. “For if your claim is true, then lo! a fëa [meaning something close to “soul”] which is here but a traveller is wedded indissolubly to a hröa [meaning something close to “body”] of Arda; to divide them is a grievous hurt, and yet each must fulfil its right nature without tyranny of the other. Then this must surely follow: the fëa when it departs must take with it the hröa. And what can this mean unless it be that the fëa shall have the power to uplift the hröa, as its eternal spouse and companion, into an endurance everlasting beyond Eä, and beyond Time? Thus would Arda, or part thereof, be healed not only of the taint of Melkor, but released even from the limits that were set for it in the ‘Vision of Eru’ of which the Valar speak.”

“Therefore, I say that if this can be believed, then mighty indeed under Eru were Men made in their beginning; and dreadful beyond all other calamities was the change in their state.”

***

“They say,” answered Andreth: “they say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end. This they say also, or they feign, is a rumor that has come down through years uncounted, even from the days of our undoing.”

“Athrabeth Finrod ah Andreth” (likely completed in 1959 but not printed until 1993 within Morgoth’s Ring, the tenth volume of Christopher Tolkien’s 12-volume series The History of Middle-earth)