David

“My mind," he said, "rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram or the most intricate analysis, and I am in my own proper atmosphere. I can dispense then with artificial stimulants. But I abhor the dull routine of existence. I crave for mental exaltation. That is why I have chosen my own particular profession, or rather created it, for I am the only one in the world.”
― Arthur Conan Doyle, The Sign of Four

“The world is full of obvious things which nobody by any chance ever observes.”
― Arthur Conan Doyle; Corrections And Editor Edgar W. Smith; Illustrators, The Hound of the Baskervilles

“Education never ends, Watson. It is a series of lessons, with the greatest for the last.”
― Sir Arthur Conan Doyle, His Last Bow

“When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.”
― Arthur Conan Doyle, The Case-Book of Sherlock Holmes