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“Coleridge’s description of Iago’s actions as "motiveless malignancy" applies in some degree to all the Shakespearian villains. The adjective motiveless means, firstly, that the tangible gains, if any, are clearly not the principal motive, and, secondly, that the motive is not the desire for personal revenge upon another for a personal injury. Iago himself proffers two reasons for wishing to injure Othello and Cassio. He tells Roderigo that, in appointing Cassio to be his lieutenant, Othello has treated him unjustly, in which conversation he talks like the conventional Elizabethan malcontent. In his soliloquies with himself, he refers to his suspicion that both Othello and Cassio have made him a cuckold, and here he talks like the conventional jealous husband who desires revenge. But there are, I believe, insuperable objections to taking these reasons, as some critics have done, at their face value.”
― W.H. Auden, The Dyer's Hand and Other Essays