The lines "Ah, distinctly I remember it was in the bleak December" and "Eagerly I wished the morrow; - vainly I had sought to borrow" from Poe's "The Raven" demonstrate the use of flashback.
Flashback is a literary device that interrupts the chronological sequence of a story to provide background information previously unknown to the reader. In the excerpt from Edgar Allan Poe's "The Raven," the lines "Ah, distinctly I remember it was in the bleak December," and "Eagerly I wished the morrow; - vainly I had sought to borrow," show the use of flashback as they reflect back to a past event, adding depth to the narrative by revealing the speaker's memories and emotions related to the lost Lenore.
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