Jealousy

• ‘Preferment goes not by title and affection, not by the did gradation where each second stood heir to first’


  Iago has reason to be jealous. ‘Othello’s affection for Cassio has got him the role of lieutenant. Iago believes it should have gone to the ‘heir’ and stuck to precedent. But as an outsider to Venice, Othello ignores tradition
• ‘twix my sheets. He’s done my office’

  Iago believes that Othello has been having sex with Emilia. ‘Thought abroad’- implies is only a suspicion
• ‘It is the green eyed monster which doth mock the meat it feeds on’

  By act 3,3, Iago has already planted the seeds of an affair. He is warning Othello that jealousy will consume him. However, It is possibly about Iago himself believing that Emilia has slept with Othello, so Iago is the monster, consuming Othello through his plan as an act of revenge.

  Jealousy is the monster that plays with victims before it feeds on them
• 'Tis a monster. Begot upon itself, born on itself’


  Emilia suggests that jealousy is a monster that does not need external force and rather fuels itself.