I can't tell you where a poem comes from, what it is, or what it is for: nor can any other man. The reason I can't tell you is that the purpose of a poem is to go past telling, to be recognised by burning.
Poetry leads us to the unstructured sources of our beings, to the unknown, and returns us to our rational, structured selves refreshed. Having once experienced the mystery, plenitude, contradiction, and composure of a work of art, we afterward have a built-in resistance to the slogans and propaganda of oversimplification that have often contributed to the destruction of human life. Poetry is a verbal means to a nonverbal source. It is a motion to no-motion, to the still point of contemplation and deep realization.
For though we often need to be restored to the small, concrete, limited, and certain, we as often need to be reminded of the large, vague, unlimited, unknown