Quotation by Sir Arthur Conan Doyle

It is a capital mistake to theorize before one has data.
Sir Arthur Conan Doyle (1859–1930), British author. Sherlock Holmes, in The Adventures of Sherlock Holmes, "Scandal in Bohemia," (1892).

In A Study in Scarlet, ch. 3, Holmes reiterated, "It is a capital mistake to theorize before you have all the evidence. It biases the judgement."
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