I. His Ruling Ideas from The Philosophy of Shelley’s Poetry in Ideas of Good and Evil by William Butler Yeats.

“In A Defence of Poetry, the profoundest essay on the foundation of poetry in English, he shows that the poet and the lawgiver hold their station by the right of the same faculty, the one uttering in words and the other in the forms of society, his vision of the divine order, the Intellectual Beauty.” [via]