Human beings cannot comprehend very large or very small numbers. It would be useful for us to acknowledge that fact.

One of the problems with expertise is that people have it in some domains and not in others.

It's clear that policymakers and economists are going to be interested in the measurement of well-being primarily as it correlates with health; they also want to know whether researchers can validate subjective responses with physiological indices.

Each additional day together is a gift. The end of the day means the end of hostilities, the recognition that the underlying shared values and commitment to the relationship trump the need for one last dig or self-righteous justification.

Economists think about what people ought to do. Psychologists watch what they actually do.

Divorced women, compared to married women, are less satisfied with their lives, which is not surprising. But they're actually more cheerful, when you look at the average mood they're in in the course of the day.

Lucky risk takers use hindsight to reinforce their feeling that their gut is very wise. Hindsight also reinforces others' trust in that individual's gut.