Show how Tintern Abbey traces Wordsworth spiritual growth as a poet.

Woodsworth's "Lines Composed a Few Miles Above Tintern Abbey," mimics and reflects his famous definition of poetry:  emotion recollected in tranquility.  He shows the process of writing poetry, at least his process. 

The poem is more about his memories of the area from when he visited five summers ago, than it is about the area in the present of the poem.  His recollections are what moves or enables him to achieve the sublime (lines 36-49). 

Notice "again I hear," "Once again," "I again repose," and "Once again," again.  Recollection.  Woodsworth is revealing how he writes.  He's giving the reader an example of how he creates.

One's reaction to nature may be more ecstatic when it's first seen, as this area was for Woodsworth when he was younger, he writes, but it is in recollection and contemplation that "We see into the life of things."  That's when Woodsworth wrote his poetry.