again here's your answer :D
By looking in the text and using context clues.
That it is Hard being in love, espically when your love leaves you. He is implieing that when your love leaves you, nothing else go's on. There is nothing in this world for you anymore, and you can not even function.
I believe that the correct answer is <span>a desire to retreat from society when necessary.
Thoreau greatly valued nature as the ultimate source of peace and happiness. He believed that humans cannot truly be happy in cities, surrounded by concrete and malice, but should rather escape to nature and lead fulfilled lives instead.
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