As in the structure of the plot, so too in the portraiture of character, the poet should always aim either at the necessary or the probable. Thus a person of a given character should speak or act in a given way, by the rule either of necessity or of probability; just as this event should follow that by necessary or probable sequence. It is therefore evident that the unravelling of the plot, no less than the complication, must arise out of the plot itself, it must not be brought about by the 'Deus ex Machina'--as in the Medea, or in the Return of the Greeks in the Iliad. The 'Deus ex Machina' should be employed only for events external to the drama,--for antecedent or subsequent events, which lie beyond the range of human knowledge, and which require to be reported or foretold; for to the gods we ascribe the power of seeing all things. Within the action there must be nothing irrational. If the irrational cannot be excluded, it should be outside the scope of the tragedy. Such is the irrational element in the Oedipus of Sophocles.
deus로 검색했더니 걍 해당 구절이 바로 나오네.