Your film is like your children. You might want a child with certain qualities, but you are never going to get the exact specification right. The film has a privilege to live its own life and develop its own character. To suppress this is dangerous. It is an approach that works the other way too: sometimes the footage has amazing qualities that you did not expect.
Werner HerzogWithout dreams we would be cows in a field, and I don't want to live like that. I live my life or I end my life with this project.
Werner Herzog