Since my computer keeps telling me that there's an "error on page," I decided to save the quote from Lewis and add a thought here because the idea of typing all that over again is truly appalling.
What I wanted to add in explanation is a bit from Dante. The first real "images" of damnation Dante encounters in the Inferno are the lovers, Paolo and Francesca, in the circle of lust. Dante talks to Francesca and in effect is overwhelmed; he faints, and well he should for what he is doing in the Comedia is exploring and defining the Romantic Way, the affirmation of images, and at the center of that great diagram which is the poem is the figure of Beatrice, the Romantic beloved. Romantic love, Dante discovers right at the beginning, can lead to Hell if it becomes an end in itself, if the lover is not able to say finally about the beloved, "Neither is this Thou." Paolo and Francesca preferred one another to God at their crisis moment and hell is the consequence. God says to them in effect, "Thy will be done."
Dante, much as he loves Beatrice, does understand and makes the right response. At the end of the glorious Paradiso where, thanks to Beatrice, Dante's love has been rightly ordered throughout, Dante receives a new guide, a monk, a contemplative, an Ascetic, St. Bernard who directs Dante's gaze from Beatrice to the virgin Mary in order to prepare him finally to look upon God Himself, and especially upon the face of the second person of the Trinity, the glorified human Christ, the second person of the Holy Trinity. As is clear in the second canto of the Inferno, Beatrice is the means by which Dante is led to God. This also is Thou. Dante is the great poet of the Affirmation, of the fact of God's presence in creation. But before God everything must go, in a sense, even one's idea of God. The self must finally be empty of all images in order to receive the real presence of the eternal God Himself. Neither is this Thou.
I apologize for my clumsy explanations, but I highly recommend Charles Williams' The Figure of Beatrice for a clear and precise explanation of Dante's poetry and of the two ways in Dante's work. The first chapter of the work defines clearly the two ways. If you prefer fiction for illumination, read Dante, of course, and Charles Williams' All Hallows' Eve, the best of his supernatural thrillers.