A lot of experience can be an excellent teacher. A single experience, not so much. Looking across a large enough set of decisions and outcomes, we ca… - Annie Duke

It's a shame the social contract for poker players is so different than for the rest of us in this regard because a lot of good can result from someone saying, "Wanna bet?" Offering a wager brings the risk out in the open, making explicit what is already implicit (and frequently overlooked). The more we recognize that we are betting on our beliefs (with our happiness, attention, health, money, time, or some other limited resource), the more we are likely to temper our statements, getting closer to the truth as we acknowledge the risk inherent in what we believe.

What is true for grit is true for optimism. Optimism gets you to stick to things that are worthwhile. But optimism also gets you to stick to things that are no longer worthwhile. And life's too short to do that.

When you are weighing whether to quit something or stick with it, you can't know for sure whether you can succeed at what you're doing because that's probabilistic. But there is a crucial difference between the two choices. Only one choice — the choice to persevere — lets you eventually find out the answer.