Startled at the stillness broken by reply so aptly spoken,
"Doubtless," said I, "what it utters is its only stock and store,
Caught from some unhappy master whom unmerciful Disaster

from Edgar Allan Poe – The Raven on Rap Genius

Meaning

He’s still trying to rationalize the talking raven, by explaining to himself that the raven learned to say “nevermore” from a previous master, who is sad enough to repeat “nevermore” that often.

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