You never know where your next movie is going to come from. You just have to fall in love with something because it's going to be taking up every moment of spare time in your life for about two years. You're going to be dreaming about it and thinking about it and becoming obsessed with it.
You never have any idea where your movie's going to go when you're shooting - you're in this little bubble. Everything you care about is getting the next step right: getting the script right, finding the right actors, shooting it. Then you spend half a year in a dark room editing your film, and you don't talk to anybody.