Hunger Was Good Discipline

One book I'm lugging around is Hemingway's memoir of his early years writing in Paris, A Moveable Feast.  Here is a passage that's been stuck in my head for several years now:

You got very hungry when you did not eat enough in Paris because all the bakery shops had such good things in the windows and people ate outside at tables on the sidewalk so that you saw and smelled the food. When you had given up journalism and were writing nothing that anyone in America would buy, explaining at home that you were lunching out with someone, the best place to go were the Luxembourg gardens where you saw and smelled nothing to eat all the way from the Place de l'Observatoire to the rue de Vaugirard. There you could always go into the Luxembourg museum and all the paintings were sharpened and clearer and more beautiful if you were belly-empty, hollow-hungry. I learned to understand Cezanne much better and to see how he made landscapes when I was hungry. I used to wonder if he were hungry too when he painted; but I thought possibly it was only that he had forgotten to eat. It was one of those unsound but illuminating thoughts you have when you have been sleepless or hungry. Later I thought Cezanne was probably hungry in a different way.