a leading indicator
(You'll all likely hear this word a lot in relation to the Coakley/Brown race over the next two days)
Happiness is always a by-product. It is probably a matter of temperament, and for anything I know it may be glandular. But it is not something that can be demanded from life, and if you are not happy you had better stop worrying about it and see what treasures you can pluck from your own brand of unhappiness.