Why do we read and write poetry? (Dead Poets Society)

Dead Poets Society is a wonderful film, obviously filled with a lot of references to English and American poetry. In this scene, John Keating (Robin Williams) teaches his pupils the reason for reading and writing poetry, quoting Whitman’s Leaves of Grass: O ME! O life!... of the questions of these recurring; Of the endless trains of the faithless—of cities fill’d with the foolish; Of myself forever reproaching myself, (for who more foolish than I, and who more faithless?) Of eyes that vainly crave the ligh