There are a great many people who have all the material conditions of happiness, i.e. health and a sufficient income, and who, nevertheless, are profoundly unhappy. In such cases it would seem as if the fault must lie with a wrong theory as to how to live. In one sense, we may say that any theory as to how to live is wrong. We imagine ourselves more different from the animals than we are. Animals live on impulse, and are happy as long as external conditions are favorable. In civilized societies, especially in English-speaking societies, this is too apt to be forgotten. People propose to themselves some one paramount objective, and restrain all impulses that do not minister to it. A businessman may be so anxious to grow rich that to this end he sacrifices health and private affections. When at last he has become rich, no pleasure remains to him except harrying other people by exhortations to imitate his noble example.