The quote from Herman Melville's "Moby-Dick" suggests a vivid image of death being personified as a postal worker. It conveys the sense of inevitability and the grim reality that envelopes the characters, emphasizing their entanglement with mortality. This metaphor implies that the news contained within such a letter is grave, potentially signaling the end or significant loss. It highlights the weight and seriousness of the communication being referenced.

The language in the quote evokes a haunting atmosphere, reinforcing the theme of death that permeates the narrative of "Moby-Dick." The notion of Death as a post-boy serves to remind readers of the ever-present dangers that sailors encounter on their voyages. It underscores the precariousness of life at sea, where the line between existence and oblivion is often blurred, reflecting Melville’s exploration of fate and existentialism throughout the novel.