Creon's flaw, his pride, causes him to make the choices that lead to his downfall. At the same time Creon's downfall also can be viewed as a punishment from fate for his actions.
The answer that best completes the above sentence is "Positive self talk"
This is firstly because, internal motivation comes from with oneself, and not form another (motivation from another person is external motivation). Having said that, in motivating oneself, it is important for a person to be able to talk positively to themselves; this increases self-esteem which in turn leads to increased motivation.