There is in all these poems of the Middle Ages a marked character which distinguishes them from those of Greece and Rome.  We characterize this difference by calling the first Romantic and the other Classic.  Yet these appellations are only uncertain rubrics, and have led hitherto to the most discouraging, wearisome entanglements, which become worse since we give to antique poetry the designation of “Plastic,” instead of “Classic.”  From this arose much misunderstanding; for, justly, all poets should work their material plastically, be it Christian or heathen; they should set it forth in clear outlines; in short, plastic form should be the main desideratum in modern Romantic art, quite as much as in the ancient.  And are not the figures in the Divina Commedia of Dante or in the pictures of Raphael as plastic as those in Virgil?  The difference lies in this, that the plastic forms in ancient art are absolutely identical with the subject or the idea which the artist would set forth, as, for example, that the wanderings of Ulysses mean nothing else than the journeyings of a man named Odysseus, who was son of Laertes and husband of Penelope; and further, that the Bacchus which we see in the Louvre is nothing else than the graceful, winsome son of Semele, with audacious melancholy in his eyes and sacred voluptuousness on his soft and arching lips.  It is quite otherwise in Romantic art, in which the wild wanderings of a knight have ever an esoteric meaning, symbolizing perhaps the erring course of life.  The dragon whom he overcomes is sin; the almond which from afar casts comforting perfume to the traveler is the Trinity, God the Father, God the Son, and God the Holy Ghost, which are three in one, as shell, fibre, and kernel make one nut.  When Homer describes the armor of a hero, it is a good piece of work, worth such and such a number of oxen; but when a monk of the Middle Ages describes in his poems the garments of the Mother of God, one may be sure that by this garb he means as many virtues, and a peculiar significance lies hidden under this holy covering of the immaculate virginity of Maria, who, as her son is the almond-kernel, is naturally sung as the almond-flower.  That is the character of the medieval poetry which we call Romantic.

Classic art had only to represent the finite or determined, and its forms could be one and the same with the idea of the artist.  Romantic art had to set forth, or rather signify, the infinite and purely spiritual, and it took refuge in a system of traditional, or rather of parabolistic symbols, as Christ himself had sought to render clear his spiritualistic ideas by all kinds of beautiful parables.  Hence the mystical, problematic, marvelous, and transcendental in the artwork of the Middle Ages, in which fantasy makes her most desperate efforts to depict the purely spiritual by means of sensible images, and invents colossal follies, piling Pelion on Ossa and Parsifal on Titurel to attain to heaven.