One's first impulse is to treat these self-inflicted sufferings as ridiculous and almost idiotic. But they are quite apt to beset people of effectiveness and ability. To call them irrational does not cure them, because they lie deeper than any rational process, and are in fact the superficial symptoms of some deep-seated weakness of nerve, while their very absurdity, and the fact that the mind cannot throw them off, only proves how strong they are. They are in fact signs of some profound uneasiness of mind; and the rational brain of such people, casting about for some reason to explain the fear with which they are haunted, fixes on some detail which is not worthy of serious notice. It is of course a species of local insanity and monomania, but it does not imply any general obscuration of faculties at all. Some of the most intellectual people are most at the mercy of such trials, and indeed they are rather characteristic of men and women whose brain is apt to work at high pressure. One recollects in the life of Shelley, how he used to be haunted by these insupportable fears. He was at one time persuaded that he had contracted leprosy, and he used to disconcert his acquaintances by examining solicitously their wrists and necks to see if he could detect symptoms of the same disease. There is very little doubt that as medical knowledge progresses we shall know more about the cause of such hallucinations. To call them unreal is mere stupidity. Sensible people who suffer from them are often perfectly well aware of their unreality, and are profoundly humiliated by them. They are some disease or weakness of the imaginative faculty; and a friend of mine who suffered from such things told me that it was extraordinary to him to perceive the incredible ingenuity with which his brain under such circumstances used to find confirmation for his fears from all sorts of trivial incidents which at other times passed quite unnoticed. It is generally quite useless to think of removing the fear by combating the particular fancy; the affected centre, whatever it is, only turns feverishly to some other similar anxiety. Occupation of a quiet kind, exercise, rest, are the best medicine.