This posting briefly explores it in terms of classical Jungian concepts (i.e. self, shadow, archetypes, individuation).
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As you assess the poem and connect it to the theme of the human desire to look beyond depression and possibly suicide or self medication to seek the beauty of daily imagery in life, please allow some of my notes to help.
First, please notice that the poem reiterates the overall theme of coping with or managing sadness. In a sense, it is a "self help" type of poem. As Keats proclaims in the second stanza not to "go to Lethe" or use "the ruby grape of Prosperpine" he encourages the reader not to seek harmful alternatives to life's sadness. Because his allusion to Prosperpine conjures images of the mythological queen of the underworld, you might use the mother archetype. Instead, Keats encourages the reader to promote self awareness in regards to depression or human suffering. The mythological allusions also seem to imply the collective unconscious that Jung emphasizes in his theory.
As you explore the second stanza, the more ...
Keats' poem is assessed using Jungian theory.