The rate at which you learn and progress in the world depends on how willing you are to weigh the merit of new ideas, even if you don’t instinctively like them

Closed-minded people have trouble holding two thoughts simultaneously in their minds.

This reminds me of the memorable quote by Charlie Munger: “The human mind is a lot like the human egg, and the human egg has a shut-off device. When one sperm gets in, it shuts down so the next one can’t get in.” It’s our nature to close our minds around our favorite ideas, but this is not the ideal way to think and learn.

Open-minded people can take in the thoughts of others without losing their ability to think well—they can hold two or more conflicting concepts in their mind and go back and forth between them to assess their relative merits.

 https://www.fs.blog/2017/09/open-closed-minded/