I have heard, Mr. Holmes, that you can see deeply into the manifold wickedness of the human heart.

It is of the highest importance in the art of detection to be able to recognise out of a number of facts which are incidental and which are vital.

The weak man becomes strong when he has nothing, for then only can he feel the wild, mad thrill of despair.

The most difficult crime to track is the one which is purposeless.

If you had killed Watson, you would not have got out of this room alive.

How sweet the morning air is! ...How small we feel with our petty ambitions and strivings in the presence of the great elemental forces of Nature!

Keep your revolver near you night and day, and never relax your precautions.