WIST

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.

Sir Arthur Conan Doyle (1859-1930) British writer and physician
“A Scandal in Bohemia” [Holmes] (1891)
Full text. Sometimes conflated with "No, no: I never guess. It is a shocking habit -- destructive to the logical faculty." from The Sign of the Four.

The world is full of obvious things which nobody by any chance ever observes.

Sir Arthur Conan Doyle (1859-1930) British writer and physician
The Hound of the Baskervilles, ch. 3 [Holmes] (1901-02)
    (Source)

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.

Sir Arthur Conan Doyle (1859-1930) British writer and physician
The Sign of Four, ch. 6, (Sherlock Holmes) (1889)