"It is a great thing to have a friend whose mind works like your own."

"A man should keep his little brain attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library, where he can get it if he wants it."

"There is nothing more deceptive than an obvious fact."

"Never trust to general impressions, my dear Watson, but concentrate yourself upon details."

"The very atmosphere of the room seemed to be impregnated with the spirit of crime."