"Dr. Munro, sir," said he, "I am a walking museum. You could fit what ISN'T the matter with me on to the back of a -- visiting card. If there's any complaint you want to make a special study of, just you come to me, sir, and see what I can do for you. It's not every one that can say that he has had cholera three times, and cured himself by living on red pepper and brandy."

Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.

They say that genius is an infinite capacity for taking pains," he remarked with a smile. "It's a very bad definition, but it does apply to detective work.

Of all ghosts the ghosts of our old loves are the worst.

I know, my dear Watson, that you share my love of all that is bizarre and outside the conventions and humdrum routine of daily life.

It may be that you are not yourself luminous, but that you are a conductor of light. Some people without possessing genius have a remarkable power of stimulating it.

There is a mystery about this which stimulates the imagination; where there is no imagination there is no horror.