Happiness, like other emotions, is not something you obtain, but rather something you inhabit. When you're raging pissed and throwing a socket wrench at the neighbor's kids. You are not self- conscious about your state of anger. You are not thinking to yourself, "Am I finally angry? Am I doing this right?" No, you're out for blood. You inhabit and live the anger. You are the anger. And then it's gone.
Just a confident man doesn't wonder if he's confident, a happy man does not wonder if he's happy. He simply is.
What this implies is that finding happiness is not achieved itself, but rather is it's the side effect of a particular set of ongoing life experiences. This gets mixed up a lot, especially since happiness is marketed to much these days as a goal in and of itself. But you can't buy happiness and you can't achieve happiness. It just in. And it is once you get other parts if your life in order.