Outer travel becomes the setting of inner travel, but if the mood is somewhat that of the Odyssey, the travelers are less able and confident than Odysseus, and the world less viable to purpose. The width of things and the isolation of the characters look forward to much in the Hellenistic Age, and even in the Aeneid, rather than back to the sureness of the Odyssey. Of the classical Greek writers, Euripides notably created a language for privacy of experience, and he paradoxically did so by pressing intellectually farther than other poets and finding no solution in it.
—John H. Finlay, Jr., “The Theoretical Mind,” Four Stages of Greek Thought (Stanford U. Press, 1966)