I’ve always really enjoyed stoic wisdom. Here’s a nice snippet from a post on happiness on LifeHacker:
I like to think of life as a drinking glass, and water as the things you want and need in life. Happiness and contentedness—what Seneca calls “enough”—is when your glass is filled to the brim with water. The more you want, however, the larger your glass has to be, and that means it will take you more water to fill your glass and achieve happiness. Moreover, you’ll spend your life hating the fact your glass isn’t full, when you could have spent your energy finding ways to actually fill it. On the other hand, if you have a small glass, it takes very little water to fill it, and that makes it much easier to reach that state of contentedness.