Now we live in a world of activity. Every day, all over the world, people are writing, working, laughing, walking, eating. If you wanted to make a full list of what men and women do in the course of a day, you would probably run out of paper and patience before you ran out of activities. Now these activities are done for many different motives. The most obvious and patent motive is that of supporting one's existence.
People work at their jobs because they have to earn a livelihood.
They have to support themselves and those who depend on them, and this needs a lot of activity, unless your father happens to be president of General Motors. There is also the motive of pleasure. People go to a concert or a theater or build model airplanes because they enjoy doing so. This is the second motivation for human activity. Lastly, we do certain things because we feel we have a duty to do them.