Firstly, The Prelude is strongly concerned with the link between humanity and the natural world. Wordsworth describes his childhood experiences with nature and his almost religious union with the natural world at that time. The Romantics revered nature, which they saw as a purer state of being than human society with its customs and artifice.
Secondly, the poem deals strongly with the individual. Romantics believed the individual was of great importance and conformity was to be resisted. Alone in nature, the young Wordsworth is alone with himself, and he claims this was a positive thing, to have time in solitude and not have anyone else influence him. This is a kind of freedom, as he describes in the passage from Book One below:
Oh there is blessing in this gentle breeze,
A visitant that while it fans my cheek
Doth seem half-conscious of the joy it brings
From the green fields, and from yon azure sky.
Whate'er its mission, the soft breeze can come
To none more grateful than to me; escaped
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