"My mind 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."

"Elementary, my dear Watson."

"The little things are infinitely the most important."

"Depend upon it there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the…"

"My dear Watson, you were in my mind, just as I was in yours."