We think of happiness as an emotion: I feel happy today. But there’s a sense in which happiness is simply an objective state. For example, I have a job, and so am able to take care of my family. That’s a happy situation. I am much happier than if I had no job, and were not able to take care of my family. And that’s independent of whether I feel happy or not, or whether I actually feel like going to work or not.