On a recent trip to New York with my daughter for a dance trip, she took a Bollywood class with a very sagely instructor. (See story of that trip here.) I've been thinking about something that teacher said recently. The class was high energy and she told the girls to push through their fatigue. She explained to them that energy creates energy and if you stop when you're tired, it will be harder to stop again. She was basically explaining to them Newton's first law of motion, which describes inertia. But, this law doesn't just apply to physical objects. It's mental as well. And it often applies to writing.