For me and I suspect for lots of other people too bad things actually sometimes make you think more about faith and the fact that you're not facing these things on your own.
If faith is lost there is no security and there is no life for him who does not adhere to religion.
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My gut feeling about sequels is that they should be premeditated: You should try to write a trilogy first or at least sketch out a trilogy if you have any faith in your film.