I am not sure if "fire" is a theme in the play. I think that "fire" can be a concept or a symbol in displaying Medea's rage and her intensity of emotion. "Fire" can be a symbol for her vengeance. The idea of a fire as something to provide warmth and, from an emotional sense, motivation can be applied to Medea. This emotional understanding of fire is one where she refuses to be taken advantage of and refuses to be overlooked. Yet, when uncontrolled and with added fuel, fire can be destructive. When Medea lets her jealous rage and wrath overtake her, the results are disastrous. When the Chorus indicates that action has to be taken, deliberately or not, fuel is added to this emotional fire of Medea. When fires become uncontrolled they take everything in their path until their own life is extinguished and this is seen when Medea kills her own children. There is a human representation of fire when Medea tells Jason that her "vengeance was worth the pain." The ending of the play is a visual representation of fire in human form through Medea.