Final answer:
Authors use repetition to emphasize key points and ideas, create continuity and memorable rhythms, and reinforce themes throughout their work. It is a deliberate rhetorical device for enhancing the reader's understanding and engagement with the text.
Step-by-step explanation:
Authors utilize repetition as a powerful rhetorical device to highlight significant points and unify their work. This literary technique is often employed to suggest the continuity of ideas and themes, as seen in classic works such as F. Scott Fitzgerald's The Great Gatsby and Martin Luther King Jr.'s I Have a Dream speech. Repetition can also enhance the reader's engagement by creating memorable rhythms and reinforcing the author's message. For example, in The Great Gatsby, the repeated motif of a green light symbolizes various themes in the narrative, each appearance reinforcing its significance. Likewise, King's repetition of "I have a dream" in his speech powerfully imprints the core theme of his civil rights message. Moreover, repetition can be used to connect different parts of a text, allowing readers to see the development of ideas and how characters evolve over time. This technique is far from being redundant or filler content; instead, it is a deliberate choice by the writer to emphasize and deepen the impact of their work.