The detail 'In solitude returning, saw the hills Grow larger in the darkness, all alone Beheld the stars come out above his head, And travelled through the wood with no one near To whom he might confess the things he saw. So the foundations of his mind were laid.' best develops the idea of solitude.
The detail that best develops the idea of having time in solitude is:
"In solitude returning, saw the hills Grow larger in the darkness, all alone Beheld the stars come out above his head, And travelled through the wood with no one near To whom he might confess the things he saw. So the foundations of his mind were laid."
This detail highlights the solitary experience of the individual in nature, emphasizing introspection and the development of inner thoughts without external influences.
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