 This story gives us two contrasting ways of thinking of liberty. On the one hand, one can think of liberty as the absence of obstacles external to the agent. You are free if no one is stopping you from doing whatever you might want to do. In the above story you appear, in this sense, to be free. On the other hand, one can think of liberty as the presence of control on the part of the agent. To be free, you must be self-determined, which is to say that you must be able to control your own destiny in your own interests. In the above story you appear, in this sense, to be unfree: you are not in control of your own destiny, as you are failing to control a passion that you yourself would rather be rid of and which is preventing you from realizing what you recognize to be your true interests. One might say that while on the first view liberty is simply about how many doors are open to the agent, on the second view it is more about going through the right doors for the right reasons.