In “ dover beach” by matthew arnold, how does place affect theme?

Even the insistent cough of the woman next to him wasn't enough to draw his eyes away from the tiny type of the ancient book its pages were brittle and felt like they could crumble at the slightest disturbance he noticed the musty odor if each page as he carefully it over.

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Which lines in this excerpt from act iv of shakespeare’s romeo and juliet reflect the conflict of person versus the unknown?