"If mere happiness were the point, we could easily achieve it for everyone by suitably medicating the water supply. But it has often been well said that the surest way to unhappiness is to seek happiness directly. Instead, happiness comes as a sideline of other endeavours that in themselves bring satisfaction and a sense of achievement. It is like the dot of light in a dark room that one cannot see when looking directly at it, but notices out of the corner of one's eye on looking away."
A. C. Grayling