 Another variation is the inner struggle in characters (and by extension, humans in reality) between good and evil.The form of tragedy described as best by Aristotle and exemplified by "Oedipus Rex" is, properly, concerned more with the tragic operations of fate than with a thematized conflict between good and evil.Nevertheless, the conflict between the good and the flawed aspects of the tragic hero form an important part of tragic catharsis in Aristotle's theory.