Endurance

"After focus, the next most important thing for a novelist is, hands down, endurance. If you concentrate on writing three or four hours a day and feel tired after a week of this, you're not going to be able to write a long work. What's needed for a writer of fiction - at least one who hopes to write a novel - is the energy to focus every day for half a year, or a year, two years. You can compare it to breathing. If concentration is the process of just holding your breath, endurance is the art of slowly, quietly breathing at the same time you're storing air in your lungs. Unless you can find a balance between both, it'll be difficult to write novels professionally over a long time. Continuing to breathe while you hold your breath." (#23 p.78)