I'll agree with nickpp to a point: that happiness is transient, and that one cannot appreciate happiness without having suffered (however much or little - it's all relative, it's all in your head).

Having dabbled in Zen Buddhism, I don't like the thesis that life is suffering and to escape it we need to do away with want. If you want to be an emotionless zombie, sure, to each their own. But I now think that this tendency to deign "happiness = good; sadness = bad" and MINIMAX our lives is a huge disservice to our humanity. Hey, we're humans trying to make sense of a senseless world, and we're all on this crazy ride together. I'd rather collect experiences - happy AND sad - to remind myself that I'm alive, that I'm an emotional being, and so that I can appreciate others' experiences as well.

I'm much more fond of this take on happiness:

"The deeper that sorrow carves into your being, the more joy you can contain. Is not the cup that holds your wine the very cup that was burned in the potter's oven? And is not the lute that soothes your spirit, the very wood that was hollowed with knives?" -Kahlil Gibran