I wrote with tears and anguish, pouring into the pages all that pain which life had meant to me. Externally the story had to do with a family of stockyard workers, but internally it was the story of my own family. Did I wish to know how the poor suffered in winter time in Chicago? I only had to recall the previous winter in the cabin, when we had only cotton blankets, and had rags on top of us. It was the same with hunger, with illness, with fear. Our little boy was down with pneumonia that winter, and nearly died, and the grief of that went into the book.

On his writing of The Jungle, in American Outpost: A Book of Reminiscences (1932)