WIST Quotations

Doyle, Arthur Conan -- Story (1886-04), “A Study in Scarlet,” Part 1, ch. 3, Beeton’s Christmas Annual, Vol. 28 (1887-11-21)

Dave — Thu, 29 Jan 2026 23:58:11 +0000

“You don’t seem to give much thought to the matter in hand,” I said at last, interrupting Holmes’s musical disquisition.
“No data yet,” he answered. “It is a capital mistake to theorize before you have all the evidence. It biases the judgement.”

Arthur Conan Doyle (1859-1930) British writer and physician
Story (1886-04), “A Study in Scarlet,” Part 1, ch. 3, Beeton’s Christmas Annual, Vol. 28 (1887-11-21)
(Source)

Published in novel form 1888-07.

Doyle, Arthur Conan -- Story (1891-07), “A Scandal in Bohemia,” ch. 1 [Holmes], The Strand Magazine, Vol. 2, No. 1

Dave — Mon, 05 Nov 2007 15:02:49 +0000

I have no data yet. 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 (1859-1930) British writer and physician
Story (1891-07), “A Scandal in Bohemia,” ch. 1 [Holmes], The Strand Magazine, Vol. 2, No. 1
(Source)

Collected in The Adventures of Sherlock Holmes, No. 1, ch. 1 (1892).

Holmes uses a similar phrase in The Sign of the Four (1890).