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Quotation from The Adventures of Sherlock Holmes by Arthur Conan Doyle
“It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.”
The Adventures of Sherlock Holmes, A Scandal in Bohemia (Project Gutenberg #1661)

Holmes declines to guess at the meaning of the anonymous note before his royal client arrives.
Citation: "It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts." — Arthur Conan Doyle, The Adventures of Sherlock Holmes, A Scandal in Bohemia (Project Gutenberg #1661). (id the-adventures-of-sherlock-holmes-q2)
Portrait: Adventures of sherlock holmes, Rtrace (upload first version)User:ΛΦΠ (upload second version), Public domain.
