Yet poetry is still thought of, insistently, as a product, as something answering either to a determined definition or else to a use not necessarily its own. Gregory Corso rightly said that only the poet can validate him- or herself. There is no other reference or judgment that can give more than an opinion. Opinions are rightly and generously the response an art may depend upon, but they do not determine what it is or can be.
—Robert Creeley, “Reflections on Whitman in Age,” On Earth: Last poems and an essay (U. of California Press, 2006)