Clearly, the decision-making that we rely on in society is fallible. It's highly fallible, and we should know that.

Courage is willingness to take the risk once you know the odds. Optimistic overconfidence means you are taking the risk because you don't know the odds. It's a big difference.

The most effortful forms of slow thinking are those that require you to think fast.

In a rising market, enough of your bad ideas will pay off so that you'll never learn that you should have fewer ideas.

Political columnists and sports pundits are rewarded for being overconfident.

you know you have made a theoretical advance when you can no longer reconstruct why you failed for so long to see the obvious.

Optimistic people play a disproportionate role in shaping our lives. Their decisions make a difference; they are inventors, entrepreneurs, political and military leaders - not average people. They got to where they are by seeking challenges and taking risks.