As you build things, whether they're train tracks, or bookshelves, or relationships, or essays that you've written for classes, the endowment effect … - Annie Duke

By not quitting, you are missing out on the opportunity to switch to something that will create more progress toward your goals. Anytime you stay mired in a losing endeavor, that is when you are slowing your progress. Anytime you stick to something when there are better opportunities out there, that is when you are slowing your progress.

Even research communities of highly intelligent and well-meaning individuals can fall prey to confirmation bias, as IQ is positively correlated with the number of reasons people find to support their own side in an argument

Essentially, regardless of the history they have with the decision, they ask themselves, "If I were approaching this decision fresh, would I want to enter into this course of action?"