"Bunyan... had at one time a decidedly heavy and morbid burden to bear. But, like many another nervous sufferer of the "strong type" (Koch's starker Typus), Bunyan carried this burden with heroic perseverance, and in the end won the mastery over it by a most instructive kind of self-discipline. In view of this fact, a clearer recognition of the nature of the burden, from the psychological point of view, rather helps than hinders our admiration for the author's genius, and our respect for his unconquerable manhood. It is this sort of case, in fact, that renders the study of the nervous disorders so frequently associated with genius, a pursuit adapted, in very many instances, not to cheapen our sense of the dignity of genius, but to heighten our reverence for the strength that could contend, as some men of genius have done, with their disorders, and that could conquer the nervous "Apollyon" on his own chosen battle-ground."