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Was Shakespeare Shakespeare? 11 Rules for Critical Thinking


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But perhaps best of all is the checklist of credos that underpin the analytical tool. Dubbed Prospero’s Precepts, these eleven rules culled from some of history’s greatest minds can serve as a general-purpose guideline for critical thinking in all matters of doubt:

  1. All beliefs in whatever realm are theories at some level. (Stephen Schneider)
  2. Do not condemn the judgment of another because it differs from your own. You may both be wrong. (Dandemis)
  3. 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)
  4. Never fall in love with your hypothesis. (Peter Medawar)
  5. 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)
  6. A theory should not attempt to explain all the facts, because some of the facts are wrong. (Francis Crick)
  7. The thing that doesn’t fit is the thing that is most interesting. (Richard Feynman)
  8. 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)
  9. 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)
  10. 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)
  11. 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)

Can we boil these down to just a few statements?

1. It is impossible to know everything. You know far less than you think. (paraphrasing Socrates)

2. Be very careful about the assumptions that taint what you think you know. (paraphrasing Science)

3. Have a healthy skepticism about everything. (paraphrasing Rohit Khare)

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