from Farnam Street:

https://fs.blog/11-rules-for-critical-thinking/

11 Rules for Critical Thinking

A fantastic list of 11 rules from some of history’s greatest minds. These are Prospero’s Precepts and they are found in AKA Shakespeare: A Scientific Approach to the Authorship Question:

• All beliefs in whatever realm are theories at some level. (Stephen Schneider)
• Do not condemn the judgment of another because it differs from your own. You may both be wrong. (Dandemis)
• Read not to contradict and confute; nor to believe and take for granted; nor to find talk and discourse; but to weigh and consider. (Francis Bacon)
• Never fall in love with your hypothesis. (Peter Medawar)
• It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories instead of theories to suit facts. (Arthur Conan Doyle)
• A theory should not attempt to explain all the facts, because some of the facts are wrong. (Francis Crick)
• The thing that doesn’t fit is the thing that is most interesting. (Richard Feynman)
• To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact. (Charles Darwin)
• It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so. (Mark Twain)
• Ignorance is preferable to error; and he is less remote from the truth who believes nothing, than he who believes what is wrong. (Thomas Jefferson)
• All truth passes through three stages. First, it is ridiculed, second, it is violently opposed, and third, it is accepted as self-evident. (Arthur Schopenhauer)

P.S. - 

Insight

“The willingness to accept responsibility for one's own life is the source from which self-respect springs.”

— Joan Didion