Arthur Conan Doyle

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

Education never ends Watson. It is a series of lessons with the greatest for the last.

There should be no combination of events for which the wit of man cannot conceive an explanation.

I fear that if the matter is beyond humanity it is certainly beyond me. Yet we must exhaust all natural explanations before we fall back upon such a theory as this.

Only one important thing has happened in the last three days, and that is that nothing has happened.

Perhaps, when a man has special knowledge and special powers like my own, it rather encourages him to seek a complex explanation when a simpler one is at hand.

"You know, Watson, I don't mind confessing to you that I have always had an idea that I would have made a highly efficient criminal."

Let us hear the suspicions. I will look after the proofs.

It is impossible as I state it, and therefore I must in some respect have stated it wrong.

One should always look for a possible alternative, and provide against it. It is the first rule of criminal investigation.

There is so much red tape in these matters.

"For once you have fallen low. Let us see, in the future, how high you can rise."