Final answer:
The parentheses in line 19 offer a glimpse into the speaker's internal monologue, which reveals their emotions and thought processes.
Step-by-step explanation:
The parentheses in line 19 serve to provide insight into the speaker's internal monologue. They allow the reader to understand the speakers' thought process or reflections that are not spoken aloud, thus revealing internal conflicts, uncertainties, or the speaker's reflective contemplation.
It could also indicate an aside that gives more depth to the speaker's emotional landscape, and help the reader to understand the speaker's feelings toward other characters, like the shoemaker, or the broader themes being explored in the text.