While the individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty. You can, for example, never foretell what any one man will be up to, but you can say with precision what an average number will be up to. Individuals vary, but percentages remain constant. So says the statistician.

It is a capital mistake to theorize before you have all the evidence. It biases the judgment.

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

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.

You have done all the work in this business. I get a wife out of it, Jones gets the credit, pray what remains for you?" "For me," said Sherlock Holmes, "there still remains the cocaine bottle.

You will remember that I remarked the other day, just before we went into the very simple problem presented by Miss Mary Sutherland, that for strange effects and extraordinary combinations we must go to life itself, which is always far more daring than any effort of the imagination.” “A proposition which I took the liberty of doubting.” “You did, Doctor, but none the less you must come round to my view, for otherwise I shall keep on piling fact upon fact on you until your reason breaks down under them and acknowledges me to be right.

Every man finds his limitations, Mr. Holmes, but at least it cures us of the weakness of self-satisfaction.