Final answer:
The writer uses repetition to emphasize and enhance the qualities being described.
Step-by-step explanation:
The writer's use of repetition in the lines "How pure, how dear their dwelling-place" and "So soft, so calm, yet eloquent" serves to emphasize and enhance the qualities being described. By repeating these phrases, Lord Byron creates a sense of rhythm and emphasis, drawing attention to the purity, dearness, softness, calmness, and eloquence of the subject being described in the poem, creating a lasting impact on the reader.