There are two types of people in the world. Although they have equal degrees of health and wealth and the other comforts of life, one becomes happy, the other becomes miserable. This arises from the different ways in which they consider things, persons, and events, and the resulting effects upon their minds. One is said to be optimistic and the other pessimistic about everything around them. People who are to be happy fix their attention on the conveniences of things, the pleasant parts of co...