Source identified1
Image design Linen
Read & copy
“It is a capital mistake to theorize before one has data.”
Meaning & context
Holmes argues that explanations should follow evidence because an early theory can tempt a person to force later facts into a preferred story.
Source details
“A Scandal in Bohemia,” The Adventures of Sherlock Holmes (1891), Project Gutenberg #1661. Holmes immediately warns that premature theorizing leads people to twist facts to suit theories; it is fictional detective dialogue.