These are some quotes I found important about Medea's extreme transition when it comes to her emotions. These quotes in the beginning of the play demonstrate how Jason's betrayal immediately leads to her passionate hatred that comes to define her purpose and motivation in life.
"But now there is hatred everywhere. Love is diseased." (17) Speaker: Nurse
"I am afraid she may think of some dreadful thing. For her heart is violent. (37-38). Speaker: Nurse
Great people's tempers are terrible, always, Having their own way, seldom checked, Dangerous they shift from mood to mood." (118-120). Speaker: Medea