"There are some races which are inferior and some which are superior, and the superior races have a right to rule the inferior."

"Imagination is more important than knowledge."

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

"Education never ends, Watson. It is a series of lessons, with the greatest for the last."

"The more outré and grotesque an incident is the more carefully it deserves to be examined."