If owning stocks is a long-term project for you, following their changes constantly is a very, very bad idea. It's the worst possible thing you can do, because people are so sensitive to short-term losses. If you count your money every day, you'll be miserable.

Mood evidently affects the operation of System 1: when we are uncomfortable and unhappy, we lose touch with our intuition. These findings add to the growing evidence that good mood, intuition, creativity, gullibility, and increased reliance on System 1 form a cluster. At the other pole, sadness, vigilance, suspicion, an analytic approach, and increased effort also go together. A happy mood loosens the control of System 2 over performance: when in a good mood, people become more intuitive and more creative but also less vigilant and more prone to logical errors.

The concept of happiness has to be reorganised.

You should not take your intuitions at face value.

Groups tend to be more extreme than individuals.

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

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