Answer:
Throughout the text, Thoreau uses repetition, particularly parallel structure. Example:
"Simplify, simplify"
Explanation:
Thoreau tends to use embedded repetition to emphazise a point, as urging the readers to stop burying themselves in never-ending impossible tasks and simplify their lives with: "Simplicity, simplicity, simplicity!", or in paragraph 2: maybe creating a mantra-like urging, using also derivatives of words: "live, "life": Simplify, simplify".