Self-Control and Happiness

I don't know how scientific this study is, but the results don't surprise me one bit:

"Among humankind's most valuable assets is self-control. . . the more self-control people reported having, the more satisfied they reported being with their lives. . . as they go about their daily lives, people with a lot of self-control appear to generally be in higher spirits; in the long run, they're happier with their lives."