Justice is a thing in which you repay someone in an even, fair amount. If you have stolen something from somebody's house, you go to jail for not a too long time: only about 16 months. Vengeance though, is the event in which someone gets paid back, so to say, in "interest," for something that they have done. For example, if you have cut off someone's hand, vengeance would be where you would have both of your hands cut off. Another example would be in which you injured someone in a car accident, but you were decapitated as punishment. Vengeance is, in some cases, horrible, the things that are done to people, like in the Greek Drama of Medea. Medea takes vengeance upon her husband through other subjects, and what she does is absolutely mad.
Medea is a "witch." She knows powerful magic and knows how to make potions. She uses her powers to win the love of a man named Jason. Medea wants his love so much that she kills her brother and betrays her father to win it. Jason then takes her to a far-away land where they have children and are living happily for a while. Later, Medea finds out that Jason has left her, without a care in the world for her. Medea weeps all day long, and keeps wishing to die . Her nurse (the maid) worries for her when she laments over Jason leaving her, and tells her not to wish of death and destruction. Medea hates Jason for leaving her , and will never forgive him for that. Jason, on top of that too, sentences Medea to a life in exile. Medea shows her hatred toward Jason by not letting Jason take his sons for their best, while she goes into exile.
Medea cooks up a devilish plan, in which she can actually kill quite a number of people. What she does is she makes a golden wreath and golden veil to send to Creon's daughter, Jason's to-be wife. She tells Jason to send those things to her so that her children would be able to stay in Colchis while Medea went into exile. The gifts are then sent.