...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.

To let the brain work without sufficient material is like racing an engine. It racks itself to pieces.

I am engaged in answering that Italian buffoon, Mazotti, whose views upon the larval development of the tropical termites have excited my derision and contempt . . .

We all learn by experience, and your lesson this time is that you should never lose sight of the alternative. Sherlock Holmes speaking with Dr. Watson.

To a great mind, nothing is little,' remarked Holmes, sententiously.

The unexpected has happened so continually in my life that it has ceased to deserve the name.