Here, despite the intelligent handling, the enigma is merely transferred from the great tragedian's work to his character: it is not solved. No solution is offered of the problem of the pantheism of the fragment above cited, which is quite irreconcilable with any orthodox belief in Greek religion, though such sayings are at times repeated by unthinking believers, without recognition of their bearing. That the pantheism is a philosophical element imported into the Greek world from the Babylonian through the early Ionian thinkers seems to be the historical fact (cp. Whittaker, as last cited): that the importation meant the dissolution of the national faith for many thinking men seems to be no less true. It seems finally permissible, then, to suggest that the "piety" of Æschylus was either discontinuous or a matter of artistic rhetoric and public spirit, and that the Prometheus is a work of profound and terrible irony, unburdening his mind of reveries that religion could not conjure away. The discussion on the play has unduly ignored the question of its date. It is, in all probability, one of the latest of the works of Æschylus (K. O. Müller, Lit. of Anc. Greece, p. 327; Haigh, Tragic Drama, p. 109). Müller points to the employment of the third actor--a late development--and Haigh to the overshadowing of the choruses by the dialogue; also to the mention (ll. 366-72) of the eruption of Etna, which occurred in 475 B.C. This one circumstance goes far to solve the dispute. Written near the end of the poet's life the play belongs to the latest stages of his thinking; and if it departs widely in its tone from the earlier plays, the reasonable inference is that his ideas had undergone a change. The Agamemnon, with its desolating problem, seems to be also one of his later works. Rationalism, indeed, does not usually emerge in old age, though Voltaire was deeply shaken in his theism by the earthquake of Lisbon; but Æschylus is unique even among men of genius; and the highest flight of Greek drama may well stand for an abnormal intellectual experience.