There is nothing like first-hand evidence.

It’s every man’s business to see justice done.

"There are one or two elementary rules to be observed in the way of handling patients," he remarked, seating himself on the table and swinging his legs. "The most obvious is that you must never let them see that you want them. It should be pure condescension on your part seeing them at all; and the more difficulties you throw in the way of it, the more they think of it. Break your patients in early, and keep them well to heel."

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

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

As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after.

A study in scarlet, eh? Why shouldn't we use a little art jargon? There's the scarlet thread of murder running through the colourless skein of life, and our duty is to unravel it, and isolate it, and expose every inch of it.