My favorite Sherlock Holmes story by Sir Arthur Conan Doyle has long been “A Case of Identity”, published as the third story in The Adventures of Sherlock Holmes in 1892. Curious as it may seem, the titular case of identity upon which the story turns is not what makes it my favorite Sherlock Holmes story. Rather, what makes the story my favorite is the brief philosophical dialogue between Holmes and Watson that frames the titular case. This extremely brief philosophical dialogue is, in my humble opinion, one of the most profound philosophical dialogues ever written.