Final answer:
Thoreau uses parallelism to contrast corporations with and without conscientious men.
Explanation:
Thoreau uses the rhetorical device of parallelism in the given statement. Parallelism involves the repetition of sentence structures for emphasis and clarity. In the quote provided, the parallel structure of contrasting statements highlights the difference between a corporation without conscientious individuals and one with them.
For example, Thoreau's statement 'a corporation of conscientious men is a corporation with a conscience' showcases parallelism by repeating the structure 'a corporation' followed by distinct qualities to illustrate the contrast.
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