In class we talked loosely about Jody's physical deterioration and the effect that had on his behavior towards Janie. As Jody's physical health deteriorates due to a combination of age, the luck of the draw (liver disease), and stubbornness (seeing the witch doctor lady instead of a medical doctor), Jody begins to lash out with increasing severity. Mr. Mitchell said something about the episode sadly making sense to us, and I agree with that. It reminds me very much of super old people who get very bitter when they realize that they can't do certain things on their own any more (drive, care for themselves, etc.).
In Jody's case it is even worse. Jody built his life around control and power, and slowly withering away must have really got to him. Right before he dies we see that he has completely lost control of one of the people he controlled best: Janie. Instead of Jody making Janie be quiet and listen to him, the tables have turned and Janie is telling Jody her mind whether he wants to hear it or not (he doesn't).
They are the final words that Jody Starks hears before he dies. Janie, finally free, casts off her hair binding and walks out of the house ready to find something (or someone) in life to make her happy. From the prologue I'm guessing that's going to be Tea Cake.