Answer:
the final stanza is filled with ambiguity and contradiction. The speaker explains that the carriage passed these sights “Centuries” ago, but that the entire time that has elapsed also feels “shorter than a Day.” In the grand scheme of eternity, hundreds of years might indeed feel like a blip on the radar. This contradiction thus highlights the difficulty of imagining eternity. Life is measured by time, moving through different stages as people age; people sense the story of their lives unfolding as time goes on. But in death, the perception of time indeed, all perceptio ceases to exist. Unless, of course, there is an afterlife, an idea which the poem seems open to but inconclusive about.
