"I have got my mind working on the infernal old problem of mind and brain, and how to construct the world out of pure experiences, and feel foiled again, and inwardly sick with the fever.  But I verily believe that it is only work that makes one sick in that way that has any chance of breaking old shells and getting a step ahead.  It is a sort of madness however when it is on you." 

WJ to Dickinson Miller re: writing