What is faith? If you believe something because you have evidence for it or rational argument that is not faith. So faith seems to be believing something despite the absence of evidence or rational argument for it.
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.