Othello act 1

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…he can set up Cassio and Desdemona and make Othello believe that the two are secret lovers. He believes this would make him gain the lieutenancy that he thinks he deserves. Iago reveals his true self to the audience in the soliloquy. His actions and words are constantly foreshadowing to his soliloquy throughout act one. This soliloquy shows how Iago plans to use and exploit whomever he needs to in order to have personal gain.