It is not for me, my dear Watson, to stand in the way of the official police force. I leave them all the evidence which I found. In over a thousand cases I am not aware that I have ever used my powers upon the wrong side. He is the Napoleon of crime, Watson. A complex mind.
All great criminals have that.
From the point of view of the criminal expert, London has become a singularly uninteresting city since the death of the late lamented Professor Moriarty. A criminal who was capable of such a thought is a man whom I should be proud to do business with. When a man embarks upon a crime, he is morally guilty of any other crime which may spring from it. There being no fear of interruption I proceded to burgle the house. Burglary has always been an alternative profession, had I cared to adopt it, and I have little doubt that I should have come to the front.