Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.
I consider that a man's brain originally is like a little empty attic, and you have to stock it with such furniture as you choose.
Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.
As a rule, said Holmes, the more bizarre a thing is the less mysterious it proves to be. It is your commonplace, featureless crimes which are really puzzling, just as a commonplace face is the most difficult to identify.
I have frequently gained my first real insight into the character of parents by studying their children.