Summary of the Twelve Virtues of Rationality by Eliezer Yudkowsky

1. Curiosity - a burning itch to know
2. Relinquishment - “That which can be destroyed by the truth should be.” - P. C. Hodgell
3. Lightness - surrender to the truth as quickly as you can
4. Evenness - do not seek to argue for one side or another, for if you knew your destination, you would already be there
5. Argument - strive for exact honesty and seek a test that lets reality judge between you
6. Empiricism - knowledge comes from observation and prediction ⇒ manifests in the experiences you anticipate
7. Simplicity - “Perfection is achieved not when there is nothing left to add, but when there is nothing left to take away.” - Antoine de Saint-Exupéry
8. Humility - take specific actions in anticipation of your own errors
9. Perfectionism - the more errors you correct in yourself, the more you notice
10. Precision - the narrowest statements slice deepest
11. Scholarship - study many sciences such as evolutionary psychology, heuristics and biases, social psychology, probability theory, decision theory and others
12. Intention - strike naturally and with purpose

Source: https://www.lesswrong.com/posts/7ZqGiPHTpiDMwqMN2/twelve-virtues-of-rationality