Hey there!
I believe the answer is not possible.
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She lost her son when he was only at the age of 2
Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
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She really enjoyed and felt a connection towards a future with brethren
