David

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

“You have a grand gift for silence, Watson. It makes you quite invaluable as a companion.”
― Arthur Conan Doyle, The Complete Sherlock Holmes

“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