Lewis has no problem citing ancient Aristotle and Athenian Plato, not to mention Wordsworth, to help clarify the medieval model. In other words, it was habitual for him to put ancients in dialogue with Christians, and medieval Christians in dialogue with Romantics, despite the intervening millennia, in a way that recalled Dante’s own blending of various eras (see his Inferno 1, where the pilgrim meets the ancient poet Virgil).
