Final answer:
After waking up, Aeneas is approached by his father who explains the Stoic cosmology and anthropology.
Step-by-step explanation:
After waking up, Aeneas is approached by his father. They meet in a secluded valley where the river Lethe flows gently through the woods. Aeneas wonders why some souls would want to return to the upper world, and his father explains the Stoic cosmology and anthropology.