The habit of excessive writing, of explaining, amplifying, and reiterating, of letter making and pamphleteering, forms a morbid symptom of known as “graphomania.” Some men may overload their natural tendency to write, but a certain class of lunatics use nearly all their mental activities in this occupation, to the endless annoyance of their friends, relatives and physicians.

"'Bryan's Mental Condition:' One Psychiatrist's View." Source: New York Times, 27 September 1896.