I think we mistake sadness for depression, because life is basically sad, and its the failure to recognize that that leads to this sort of resentment and bewilderment [...] It is, it is, and [..] you know, people just suddenly think that the world owes it to them to be happy, and they're not happy and then they think well, why aren't I happy, and makes 'em angry and then they're depressed about the fact that they're angry and they're bitter about the fact that they're depressed, and this downward cycle; why don't they just accept that life is sad and cheer up, it's not forever.
