We must look for consistency. Where there is a want of it we must suspect deception.

A study of family portraits is enough to convert a man to the theory of reincarnation.

What one man can invent, another can discover.

So complex is the human spirit that it can itself scarce discern the deep springs which impel it to action.

I never guess. It is a shocking habit destructive to the logical faculty.

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

Where there is no imagination there is no horror.