If you haven't been born rich or you haven't left the rat race yet, then you may find yourself working at something you don't really enjoy, or in a job that is tiring and stressful.
I found myself doing a job I simply didn't like and working for awful bosses a few times in my life.
In one case I just walked out. With the help of positive thinking, I found a much better job with a better pay within two weeks.
Now I wouldn't recommend you just walk out of your job!