What if we shifted our definition of "I don't know" from the negative frame ("I have no idea" or "I know nothing about that," which feels like we lack competence or confidence) to a more neutral frame? What if we thought about it as recognizing that, although we might know something about the chances of some event occurring, we are still not sure how things will turn out in any given instance? That is just the truth. If we accept that, "I'm not sure" might not feel so bad. What good poker players and good decision-makers have in common is their comfort with the world being an uncertain and unpredictable place.

The next time that you find yourself saying, "I'm just not ready to decide yet," what you should actually say is "For now I think that the status quo is still the best choice." Maybe you need more information to know whether to switch. But what shouldn't stop you from quitting (or getting that information) is that it's too scary to switch because loss aversion is too intense.

our brains evolved to create certainty and order. We are uncomfortable with the idea that luck plays a significant role in our lives. We recognize the existence of luck, but we resist the idea that, despite our best efforts, things might not work out the way we want. It feels better for us to imagine the world as an orderly place, where randomness does not wreak havoc and things are perfectly predictable.

In large part, we are what we do, and our identity is closely connected with whatever we're focused on, including our careers, relationships, projects, and hobbies. When we quit any of those things, we have to deal with the prospect of quitting part of our identity. And that is painful.

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Over time, those world-class poker players taught me to understand what a bet really is: a decision about an uncertain future. The implications of treating decisions as bets made it possible for me to find learning opportunities in uncertain environments. Treating decisions as bets, I discovered, helped me avoid common decision traps, learn from results in a more rational way, and keep emotions out of the process as much as possible.

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As Nietzsche points out, regret can do nothing to change what has already happened. We just wallow in remorse about something over which we no longer have any control. But if regret happened before a decision instead of after, the experience of regret might get us to change a choice likely to result in a bad outcome.

People didn't even agree on what the terms always and never meant! If you're like most people, you were pretty surprised by these results. Most of us aren't aware of the wide range of what these words mean to different people. We assume that when we use a term, other people use it in the same way we do and mean the same thing we do.

Experience is necessary for learning. But we process that experience in a biased way. This means that the very feedback you need to become a better decision-maker can interfere with your ability to learn good lessons from experience.

What I've generally found is that two people whose positions on an issue are far apart will move toward the middle after a debate or skilled explanation of the opposing position. Engaging in this type of exchange creates an understanding of and appreciation for other points of view much deeper and more powerful than just listening to the other perspective. Ultimately, it gives us a deeper understanding of our own position.

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When we have a negative opinion about the person delivering the message, we close our minds to what they are saying and miss a lot of learning opportunities because of it. Likewise, when we have a positive opinion of the messenger, we tend to accept the message without much vetting. Both are bad.

The lesson here is that we shouldn't wait to be forced to find a Plan B. We should always be doing some exploration, especially because sometimes Plan B can turn out to be better than the thing you're already pursuing.

Luck is what intervenes between your decision (which has a range of possible outcomes) and the outcome that you actually get. Because any decision determines only the set of possible outcomes (some good, some bad, some in between), this means good outcomes can result from both good and bad

But for so many of us, that fear of falling short makes us not want to start. As Richard Thaler quipped, "If a gold medal in the Olympics is the only grade that passes, you do not want to ever take your first gymnastics class."