Answer/Explanation:
At first, the speaker hears a strange noise, and without knowing that it was the raven, he detracts from it by saying: "Tis some visitor, "I muttered," tapping at my chamber door. Only this, and nothing more. "
Then he uses the raven to calm his thoughts about Lenore and repeats again: "'Tis some visitor entreating entrance at my chamber door; Some late visitor entreating entrance at my chamber door; -This it is, and nothing more."
The presence of the raven begins to bother the speaker, who tried to "apologize" to the visitor for not having heard him: "But the fact is I was napping, and so gently you came rapping. And so faintly you came tapping, tapping at my chamber door. That I scarce was sure I heard you "
As the story progresses, the speaker begins to be tortured by this raven that the only thing he says is "Nevermore."
Finally, this despair leads him to realize that he will no longer find another love like Lenore, and that she will never return: “It shall clasp a sainted maiden whom the angels name LenoreClasp a rare and radiant maiden whom the angels name Lenore.” Quoth the Raven, "Nevermore."
