What does the word eternal indicates in the poem voice of rain

Answer

as someone else said on here

"explained its upward movement towards the sky as eternal.  The poet says that, similar to the rain, a song starts from the heart of the singer, travels to reach others and, after fulfilling it purpose (whether cared for or not) returns to the singer with all due love. "

i think of it as the sky is the limit , so like it can go on forever as far as we know.  There isn't an end.

it is the : d because is true