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

We are often confident even when we are wrong, and an objective observer is more likely to detect our errors than we are.

People who face a difficult question often answer an easier one instead, without realizing it.

You are more likely to learn something by finding surprises in your own behavior than by hearing surprising facts about people in general.

I used to hold a unitary view, in which I proposed that only experienced happiness matters, and that life satisfaction is a fallible estimate of true happiness.

There are domains in which expertise is not possible. Stock picking is a good example. And in long-term political strategic forecasting, it's been shown that experts are just not better than a dice-throwing monkey.

Optimism is normal, but some fortunate people are more optimistic than the rest of us. If you are genetically endowed with an optimistic bias, you hardly need to be told that you are a lucky person - you already feel fortunate.