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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
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Interpretation

What this quote means

The quote emphasizes the importance of data and facts in forming theories rather than allowing preconceived notions to distort reality.

Arthur Conan Doyle warns against the danger of forming theories without adequate data. When individuals create theories prematurely, they risk manipulating facts to support their ideas rather than adapting their theories based on the evidence available, which can lead to erroneous conclusions and misunderstandings of the truth.

Themes

DataTheoryFactsEvidenceScience

In practice

Example use cases

During a scientific conference, this quote could be used to emphasize the necessity of data in research presentations.

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It has always seemed to me that so long as you produce your dramatic effect, accuracy of detail matters little. I have never striven for it and I have made some bad mistakes in consequence. What matter if I hold my readers?
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I could not rest, Watson, I could not sit quiet in my chair, if I thought that such a man as Professor Moriarty were walking the streets of London unchallenged.
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It seems very strange ... that in the course of the world's history so obvious an improvement should never have been adopted. ... The next generation of Britishers would be the better for having had this extra hour of daylight in their childhood.
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