The first thing that sprang into mind was a vague recollection of Plato or Aristotle stating that you can not judge whether a person is (or has been) truly happy until the end of their life.
Not totally relevant to the OP, perhaps, except in the establishment of happiness as a fleeting thing.
I also vaguely recall a college friend telling me that their Psych 101 professor talked about how one can sometimes view certain emotional states ax combinations of others (e.g., IIRC, guilt = happiness + frustration). I don’t know how valid this view of emotions really is, but I’ll use it to posit that happiness is something like a combination of relief and pride.
I say this because I think what makes us truly happy is having gone through some sort of trial and feeling that we have prevailed. The trial need not be anything life-threatening or earth-shattering.
For instance, I have been particularly happy for the last several days. The prime reason for this is that I spent a year teaching in a traditional classroom (a first for me), and now have the summer off with pay (read 'em and weep, folks
)
This year was difficult, to say the least, but I feel like I did a god job and I’m glad to have seen it through more or less successfully. I am also relieved and proud that:
[ul]
[li]I don’t have to look for a job all summer like I did last year[/li][li]My wife and I have enough money that we don’t need to find extra work during our vacation, resulting in my first unscheduled summer since I was about 5.[/li][li]I have been successful to the point where I can afford a computer and internet service, and that I have held my own in intellectual here on the boards.[/li][/ul]
In short, I have no reason not to be happy. At the moment.
My department head tells me he had the same experience last summer, his first one off since he was 18. By the end he was clawing the walls out of boredom. I can understand.
We are not made for perfect happiness, IMO. Our happiness derives inherently from tribulation, however small. Therefore we can not always be happy under any circumstances. We must toss ourselves out into the world, and succeed at something in order to be happy. When we don’t, we suffer.