The line "And the tide rises, and the tide falls," repeated at the end of each stanza in Longfellow's poem, driving the theme of life's relentless rhythm; The frequent re-use of a dramatic line like "Nevermore" in "The Raven," highlighting the narrator's despair as the story unfolds; A line repeated at the end of stanzas in an oral ballad to remind the audience of a key action or outcome, e.g., "And the battle was done before the sun was high"; A stanza that recapitulates the hero's main motivation after each trial he faces;