Worry implies that we don't quite trust that God is big enough, powerful enough, or loving enough to take care of what's happening in our lives. Stress says that the things we are involved in are important enough to merit our impatience, our lack of grace toward others, or our tight grip of control.
From start to finish, this movie is obviously about God. He is the main character. How is it possible that we live as though it is about us?
If life were stable, I'd never need God's help. Since it's not, I reach out for Him regularly. I am thankful for the unknowns and that I don't have control, because it makes me run to God.