“Thinking in bets starts with recognizing that there are exactly two things that determine how our lives turn out: the quality of our decisions and luck.”

Why it was said

Annie Duke sets this out at the start of Thinking in Bets, drawing on her years as a professional poker player. It is the frame the rest of the book builds on: because outcomes mix decision quality with luck, you cannot judge a decision by its result alone.

What it actually means

The sentence is simple, and its consequence is not. If only two things shape outcomes, and one of them is out of your control, then a good result can follow a bad decision and a bad result can follow a good one. Duke calls the habit of judging decisions by their outcomes 'resulting', and much of the book is about unlearning it. The useful shift is to evaluate how you decided: what you knew, what you assumed, which alternatives you considered. That is the part you can improve. Luck will not even out in any single case, but good decisions made repeatedly tilt the odds over time.

How to use it

1. 1After an important outcome, good or bad, write down what you knew when you decided, before you look at what happened next.
2. 2When you catch yourself saying a decision was right because it worked out, ask what would have made it wrong.
3. 3Before a big choice, estimate how confident you are as a percentage; it forces you to admit the role of luck in advance.