I'm saying that the happy ones are the people who have either realized that being "smart" won't make you happy and thus look elsewhere, but use their intelligence to facilitate their own growth as happy people, or lack what's called "intelligence" in the first place and do the same.

The unhappy people are the ones that either use their intelligence to complicate their search for meaning, or use their thick-headedness to complicate other people's happiness. The latter might not know that they are unhappy, though.