What do stanzas 9 and 10 of The Raven mean?

In stanzas 9 and 10 of "The Raven," the narrator is desperately seeking solace from the bird, asking if there is respite in the afterlife from the grief he feels over his lost love Lenore. The raven's response of "Nevermore" signifies that there is no escape from this pain, deepening the narrator's despair and sorrow.