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

The stage lost a fine actor, even as science lost an acute reasoner, when [Holmes] became a specialist in crime.

I had neither kith nor kin in England, and was therefore as free as air -- or as free as an income of eleven shillings and sixpence a day will permit a man to be. Under such circumstances, I naturally gravitated to London, that great cesspool into which all the loungers and idlers of the Empire are irresistibly drained.

...while the individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty.

My name is Sherlock Holmes. It is my business to know what other people do not know.

Steel True, Blade Straight.

You know my methods. Apply them.