When I Heard the Learn'd Astronomer is a poem that extols the virtues of true connection to the natural world. In the poem, the speaker is listening to an astronomer explain things with charts and figures and diagrams, but finds himself sick of such technical things; it isn't until he goes outside and actually looks at the stars that he feels at peace. This poem explores themes of spirituality, true wisdom, and nature.
Boasting the largest collection of book summaries, BookRags is the best option for titles you can't find elsewhere. They offer all of the basics (quotes, chapter summary, characters, historical context, literary criticism) but also walk through a few major topics that recur throughout the book, which can be particularly useful for essay writing.