It is a capital mistake to theorize before you have all of the evidence. It biases the judgement.

More information about this quote

Authentication Score 2

Original Citation

Doyle, Arthur Conan. "A Study in Scarlet." Beeton's Christmas Annual. London: Ward Lock & Co., 1887.

Current Citation

Doyle, Arthur Conan. A Study in Scarlet. The Sherlock Holmes Collector's Library. Detective Fiction, 2012, pt. 1, ch. 3.