The Green-Eyed Monster There are evil and manipulative people in this world. Iago, in William Shakespeare's Othello, is a great example. He uses people's weaknesses, honor, and ignorance to control them, fueled by the "green-eyed monster" himself (III.iii.166). Jealousy lives in every human being, no matter how kind-hearted he is, but it is an option whether to recognize it or not. Unlike Iago, Othello was not aware of the jealousy within him; therefore, he was unable to control it. Iago uses this opportunity to reveal Othello's inner jealousy and guide him through the tragedy by manipulating the other characters. Jealousy controls almost all the characters from the beginning of the play. Roderigo is jealous of Othello because he has Desdemona, and until the end, when Othello kills his faithful wife because he believes she was having an affair with Cassio. Much of the jealousy in the play is due to Iago lying, controlling, and deceiving people under the guise of his honesty. He is trying to make everyone feel what has consumed him, jealous of Cassio for having a higher status and hatred of Othello for giving to Cassio. Othello displays a numerous amount of symptoms that suggest that he suffers from such dementia caused by Iago's misleading facts. Iago convinces Othello that his wife is having an affair with Cassio. Othello loses his heroic personality because he is now mentally unstable and decides to "tear her to pieces" (IV.i.202). Unlike Othello, Iago's jealousy does not derive from a dementia caused by the loved one but is fueled by envy. This allows him to always think and plan his plan. An extraordinary example of Iago's jealousy, brilliant mind and deviousness is when Cassio finds on his bed the handkerchief that Emilia had placed there by pure coincidence, which sends Othello over the bed.