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Quotation from A Study in Scarlet by Arthur Conan Doyle

“It is a capital mistake to theorize before you have all the evidence. It biases the judgment.”

Arthur Conan Doyle (spoken by Sherlock Holmes)

A Study in Scarlet, Part I, Ch. 3 (Project Gutenberg #244)

Holmes refuses to guess at the Brixton Road case before he has seen the scene.

Citation: "It is a capital mistake to theorize before you have all the evidence. It biases the judgment." — Arthur Conan Doyle, A Study in Scarlet, Part I, Ch. 3 (Project Gutenberg #244). (id a-study-in-scarlet-q1)

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Quote card: It is a capital mistake to theorize before you have all the evidence. It biases