" Because your rational mind knows that tunnels have two ends, your emotional mind can be kept in check when pitch blackness descends in the confusing middle. Instead of collapsing into a nervous mess, the director who has a clear internal model of what creativity is—and the discomfort it requires—finds it easier to trust that light will shine again. The key is to never stop moving forward. "

― Ed Catmull , Creativity, Inc.: Overcoming the Unseen Forces That Stand in the Way of True Inspiration