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 through an intricate and hazardous intrigue now became irresistible. Iago did not clearly understand what was moving his desire; though he tried to give himself reasons for his action, even those that had some reality made but a small part of the motive force; one may almost say they were no more than the turning of the handle which admits the driving power into the machine. Only once does he appear to see something of the truth. It is when he uses the phrase ‘to plume up my will in double knavery.’

To ‘plume up the will,’ to heighten the sense of power or superiority—this seems to be the unconscious motive of many acts of cruelty which evidently do not spring chiefly from ill-will, and which therefore puzzle and sometimes horrify us most. It is often this that makes a man bully the wife or children of whom he is fond. The boy who torments another boy, as we say, ‘for no reason,’ or who without any hatred for frogs tortures a frog, is pleased with his victim’s pain, not from any disinterested love of evil or pleasure in pain, but mainly because this pain is the unmistakable proof of his own power over his victim. So it is with Iago. His thwarted sense of superiority wants satisfaction. What fuller satisfaction could find it than the consciousness that he is the master of the General who has undervalued him and of the rival who has been preferred to him; that these worthy people, who are so successful and popular and stupid, are mere puppets in his hands, but living puppets, who at the motion of his finger must contort themselves in agony, while all the time they believe that he is their one friend and comforter? It must have been an ecstasy of bliss to him. And this, granted a most abnormal deadness of human feeling, is, however horrible, perfectly intelligible. There is no mystery in the psychology of Iago;