Arthur Conan Doyle book summaries

“How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?”

Holmes says this to Watson while discussing the case, explaining his method of deduction.

“My mind is like a racing engine, tearing itself to pieces because it is not connected up with the work for which it was built.”

Holmes complains to Watson about his boredom and need for mental stimulation.

“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.”

Holmes advises Watson on the importance of gathering evidence before forming conclusions.

“I am the last and highest court of appeal in detection.”

Holmes boasts about his reputation as a detective, though he is being modest in context.

“There is nothing more deceptive than an obvious fact.”

Holmes remarks on the misleading nature of apparent evidence.

“I never guess. It is a shocking habit — destructive to the logical faculty.”

Holmes rebukes Watson for suggesting he might guess at a solution.