“How ever did you see that?” “Because I looked for it.”

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

All other men are specialists, but his specialism is omniscience.

It's a wicked world, and when a clever man turns his brain to crime it is the worst of all.

For the one and only time I caught a glimpse of a great heart as well as of a great brain.

It is, I admit, mere imagination; but how often is imagination the mother of truth?

Our ideas must be as broad as Nature if they are to interpret Nature.