"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."
Writes David Sosa, whose field is philosophy.