Commentary The late Kurt Vonnegut had a simple yet profound approach to writing. “When I write,” he said, “I simply become what I seemingly must become.” Stephen Hunter, another great American writer, has a similar approach to his craft today. His process isn’t so much about writing prose or creating plot or conducting research. What really matters, he says, is that the book becomes your life, always either on your mind or in your subconscious. As Hunter explained to me this week on my podcast, “Newt’s World,” writing has become a part of his normal life, like brushing his teeth. “You wouldn’t think of going out in the morning without brushing your teeth,” he said. “Well, I wouldn’t think of going to bed without writing. It’s habit, not will.” The result of this lifestyle and deep concentration has been 20 extraordinary novels, including “Black Light,” “Time to Hunt,” “Point of …