Sometimes concentration works to a disadvantage. There are some people who always think that they are unlucky, that everything they do will go wrong, who think that everybody dislikes them, that everybody hates them. Then some begin to think that they are unable to do anything, that they are incapable, useless. Others out of self-pity think that they are ill. In that way even if they are not ill they create illness. Some by concentration cherish illness, always think of it. No physician could be successful with them. An old physician once said, "There are many diseases, but there are many more patients." Once a person has become a patient through concentration, he is difficult to cure. And there are many such cases of automatic concentration to the disadvantage of man.