Roy F Baumeister in Aeon:
The difference between meaningfulness and happiness was the focus of an investigation I worked on with my fellow social psychologists Kathleen Vohs, Jennifer Aaker and Emily Garbinsky, published in theJournal of Positive Psychology this August. We carried out a survey of nearly 400 US citizens, ranging in age from 18 to 78. The survey posed questions about the extent to which people thought their lives were happy and the extent to which they thought they were meaningful. We did not supply a definition of happiness or meaning, so our subjects responded using their own understanding of those words. By asking a large number of other questions, we were able to see which factors went with happiness and which went with meaningfulness.
As you might expect, the two states turned out to overlap substantially. Almost half of the variation in meaningfulness was explained by happiness, and vice versa. Nevertheless, using statistical controls we were able to tease two apart, isolating the ‘pure’ effects of each one that were not based on the other. We narrowed our search to look for factors that had opposite effects on happiness and meaning, or at least, factors that had a positive correlation with one and not even a hint of a positive correlation with the other (negative or zero correlations were fine). Using this method, we found five sets of major differences between happiness and meaningfulness, five areas where different versions of the good life parted company.
The first had to do with getting what you want and need. Not surprisingly, satisfaction of desires was a reliable source of happiness. But it had nothing — maybe even less than nothing — to add to a sense of meaning. People are happier to the extent that they find their lives easy rather than difficult. Happy people say they have enough money to buy the things they want and the things they need. Good health is a factor that contributes to happiness but not to meaningfulness. Healthy people are happier than sick people, but the lives of sick people do not lack meaning. The more often people feel good — a feeling that can arise from getting what one wants or needs — the happier they are. The less often they feel bad, the happier they are. But the frequency of good and bad feelings turns out to be irrelevant to meaning, which can flourish even in very forbidding conditions.
The second set of differences involved time frame. Meaning and happiness are apparently experienced quite differently in time. Happiness is about the present; meaning is about the future, or, more precisely, about linking past, present and future. The more time people spent thinking about the future or the past, the more meaningful, and less happy, their lives were.
More here.