The powerful element of repressed desire is prevalent in both the theories of Sigmund Freud and Sophocles' tragedy Antigone. This concept constructs the overarching theme of both works: desire is a potent and surging force that, when repressed, will eventually exceed one's threshold for self-control. However, what results from this breaching of one's control varies: In Freud's Introductory Lectures on Psycho-Analysis, an unbalanced mediation between desire and self-control leads to the development of neuroses, while in Antigone, repressed desire forces the protagonist into action. By fulfilling her desire she liberates herself from the emotionally debilitating repression. The internal struggle against repressive factors imposes itself in the form of laws in both works. To Freud, it is the restraining and prudish norms of society that restrict one's mind and actions from the fulfillment of desires, while in Antigone it is the authoritative decree of the tyrant Creon.