Joy of Math
In many ways, I just love math. I was never paid to do research in math (never was a professor or full time instructor). I probably write about four or five pages of scribbled math a week just for the fun of it. Getting a Ph.D. in math might not have been the best financial investment of my time, but it changed the way my mind works in a pleasant way. Grad school was never hard for me, it was mostly filled with joy. I was amazed that they would pay me and cover my tuition if I taught calculus for 6 hours a week. Some mathematicians call math an obsession. Occasionally, some question will be so interesting that I can't let it go, but that only happens a few times a year. Generally speaking, I find the process of doing math to be relaxing.