T.S. Eliot on Dante, contra Valery

From The Sacred Wood — ...if it be maintained that the older poetry has a “philosophic” element and a “poetic” element which can be isolated, we have two tasks to perform. We must show first in a particular case—our case is Dante—that the philosophy is essential to the structure and that the structure is essential to the poetic beauty of the parts; and we must show that the philosophy is employed in a different form from that which it takes in admittedly unsuccessful philosophical poems.