"I am a brain, Watson. The rest of me is a mere appendix."

"I am not the law, but I represent justice so far as my feeble powers go."

"Crime is common. Logic is rare. Therefore it is upon the logic rather than upon the crime that you should dwell."

"There are some who are good, and some who are evil. And the world is full of both."

"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."