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… - Annie Duke

the pass-fail nature of goals, their inflexibility, and how pursuing them leads to ignoring other opportunities that might be available.

Silicon Valley is famous for mantras like "move fast and break things" and implementing them through strategies like "minimum viable product" (MVP). These types of agile strategies can only work if you have the option to quit. You can't put out an MVP unless you have the ability to pull it back. The whole point is to get information quickly, so you can quit the stuff that isn't working and stick with the things that are worthwhile or develop new things that might work even better.

The way our lives turn out is the result of two things: the influence of skill and the influence of luck.