My understanding is that the poem is by Tyutchev, and is called Tears, but for some reason I can't find an English translation of this poem. The fact that I can't find it makes me think I have the author or title wrong. So... Any help?
Here's Nabokov's translation:
It's available in "Verses and Versions: Three Centuries of Russian Poetry," edited by Brian Boyd and Stanislav Shvabrin.
Here's the original Russian as published on the piece:
Also worth noting, Nikolai Tcherepnin set this poem in his Four Songs, Op. 16 — you might be able to find CD notes that provide a less poetic translation than Nabokov's.