Note 15 — Chapter LVI
C. H. (Charles Henry) Tawney translation
So in Heliodorus, Æthiopica, Lib. III, cap. XIII.
ἀλλά το͂ις τ’ ἀφθάλμοις ἄν γνωσθε͂ιεν ἀτενὲς διόλου βλέποντες καὶ τὸ βλέφαρον οὔ ποτ’ ἐπιμύοντες.—In the third canto of the Purgatorio Dante is much troubled at finding that Virgil, being a disembodied spirit, casts no shadow.