Happiness is more like knowledge than like belief.
There are lots of things we believe but don’t know. Knowledge is not just up to you, it requires the cooperation of the world beyond you — you might be mistaken. Still, even if you’re mistaken, you believe what you believe. Pleasure is like belief that way. But happiness isn’t just up to you. It also requires the cooperation of the world beyond you. Happiness, like knowledge, and unlike belief and pleasure, is not a state of mind.
To live a happy life is to flourish.
One especially apt way of thinking about happiness — a way that’s found already in the thought of Aristotle — is in terms of “flourishing.” Take someone really flourishing in their new career, or really flourishing now that they’re off in college. The sense of the expression is not just that they feel good, but that they’re, for example, accomplishing some things and taking appropriate pleasure in those accomplishments. If they were simply sitting at home playing video games all day, even if this seemed to give them a great deal of pleasure, and even if they were not frustrated, we wouldn’t say they were flourishing. Such a life could not in the long term constitute a happy life.
Happiness is harder to get.
It’s enjoyed after you’ve worked for something, or in the presence of people you love, or upon experiencing a magnificent work of art or performance — the kind of state that requires us to engage in real activities of certain sorts, to confront real objects and respond to them. And then, too, we shouldn’t ignore the modest happiness that can accompany pride in a clear-eyed engagement with even very painful circumstances.
Read David Sosa's excellent piece in it's entirety here.
[Incidentally, this point isn't really new at all. Click on the pic for a merrier and melodic explanation]