"What are you looking so miserable about? There is a whole ocean of oil under our feet that no one can get at except for me!"
This is a haunting scene. Not only is it one of the most jaw dropping sequences I've ever seen, but it is a huge character metaphor and character development tool. Just look at the contrast between Daniel and his employee. Daniel is now possessed by the oil, driven by it. Even when his son has lost his hearing and his well has gone up in flames, he still looks at the big picture, and knows it's his goal.
