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Turn from The Duchess of Malfy to Macbeth, and you find an English poet as sensitive of fate, doom, destiny, “law,” the moral order, as ever was Aeschylus; nay, interpreting it perhaps more effectively than ever did Aeschylus. In the First Act we see it suggested to Macbeth by witchcraft (which is the personified foe of moral order) that he can achieve an ambition by an unlawful path, the ambition itself being suggested along with the way to it and growing as the way opens. We see them both communicated to a feminine mind, narrower, more intent and practical; because narrower, because more intent and practical, for the moment more courageous. (It was Eve that the Serpent, wily enough, selected to tempt.) Both Macbeth and his lady move to the deed under a law which—for a while—has usurped the true moral order and reversed it, he not without misgivings: the spectators all the while knowing the true order, yet held silent, watching the event. Outside the castle an owl hoots as Duncan is slain. The guilty man and woman creep back, whispering; and thereupon—what happens? A knocking on the door—a knocking followed by the growls of a drowsy if not drunken porter: “Here’s a knocking indeed! If a man were porter of hell-gate, he should have old turning the key. (Knocking again.) Knock, knock, knock! Who’s there, i’ the name of Beelzebub?” The stage direction admits Macduff, who in due course is to prove the avenger of blood: but the hand that knocks, the step on the threshold, are in truth those of the moral order returning pede claudo, demanding to be readmitted. From the instant of that first knock the ambitions of the pair roll back toward their doom as the law they have offended reasserts itself, and the witches’ palindrome In girum imus noctu, ecce! steadily spells itself backward, letter by letter, to the awful sentence, Ecce ut consumimur igni!