John Clare apparently was "the silenced Romantic Poet": his prominence was far beneath Wordsworth, Coleridge, Shelley, Byron, Blake, Keats, and Co. But Clare's one I'm glad to have discovered - he's unique in that he writes simples songs praising the environment, as well as the fragility of the self. He's complex beyond what his poetry initially entails, and is one just as worth studying as the "Great Poets" of the Romantic era - especially if anyone wants Romanticism without all the Egocentrism.
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Some of his simpler sonnets are awesome - like his tributes to his "Cottage," "To a Copse in Winter," and then another longer song that is instruction for building a cottage. It showcases his pure love of nature, with a stark difference from many Romanticists - it's not really about him in Nature, it's about his LOVE of Nature. Which is refreshing, because many Romantic poets and writers can be solipsistic in their taste, while Clare is not. His syntax is also interesting - he has an unconventional ordering of verbs, nouns, subjects, and adverbs that make his writing quite idiosyncratic.
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"I Am" is one of his signature poems, and it's about the fragility of the self. At 18 lines, it's not as long nor dense quite as one of Keats's Odes, but it's quite complex and argues that selfhood is fragile and subject to the conflicts of life. He defines his selfhood in terms of negatives to start, demonstrating its elusive nature. He makes the ironic commentary that the Self as he feels it may not be visible or whole in the World, which is where we all build the Self, at least in social/modern terms. He wants the unity of childhood back - a chance to be untroubled as a simple soul before we die into life. Great work.
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Like many Romanticists, Clare wrote many sonnets, some great, some good, some mediocre. I find the Sonnet form can get tedious, because you already had Shakespeare and Milton write the best that could ever come from the original Sonnet form. But read some of Clare's sonnets for their diversity, and as commemorations of Nature and Life.