Final answer:
The literary device used in the excerpt from Thoreau's Walden is imagery, which vividly brings to life Thoreau’s philosophies about deeply engaging with life's experiences.
Step-by-step explanation:
The literary device featured in the lines "I wanted to live deep and suck out all the marrow of life, to live so sturdily and Spartanlike as to put to rout all that was not life, to cut a broad swatch and shave close, to drive life into a corner..." from Henry David Thoreau’s Walden is imagery. These words paint a vivid picture for the reader that makes Thoreau’s abstract philosophical ideas about living a deeper, more meaningful life more tangible and understandable. The act of 'sucking out the marrow of life' suggests a full, robust engagement with life, giving the reader a strong visual and tactile sense of that engagement. The phrase invokes the physical act of getting nourishment to its fullest by using every part of something, implying Thoreau's desire to experience life in its entirety without leaving anything to waste. Furthermore, living 'sturdily and Spartanlike' evokes the austere and disciplined lifestyle of the Spartans, emphasizing the purposeful nature of this approach to life.