'... a state of happiness - of contentment or satisfaction - merely by itself is a negative state, a passive condition, which undermines things we value more: our striving and yearning, our improving and growing, our inventing and discovering. Of course, some of what goes under these adventurous names is apt to rebound on us, and often has in the past; but not as often as it has moved us forward as a species, bringing the intrinsic goods of knowledge and progress, despite the prices that have sometimes been paid for both.
It is true that happiness frequently, although not invariably, accompanies these endeavours, as smoke does fire; and when it does, it enhances them. But it is knowledge and progress which are primary, causing happiness as a side-effect; they are the goal, and the attendant happiness, when it comes, is a sign that they are being reached.'
AC Grayling, 'The Meaning of Things', p 72