Women are naturally secretive, and they like to do their own secreting.

Oh how I've missed you, Holmes.

You never tire of the moor. You cannot think the wonderful secrets which it contains. It is so vast, and so barren, and so mysterious.

He [Professor Moriarty] is the Napoleon of crime, Watson. He is the organizer of half that is evil and of nearly all that is undetected in this great city. He is a genius, a philosopher, an abstract thinker. He has a brain of the first order.

I trust that age doth not wither nor custom stale my infinite variety.

Once or twice in my career I feel that I have done more real harm by my discovery of the criminal than ever he had done by his crime. I have learned caution now, and I had rather play tricks with the law of England than with my own conscience.

The ways of fate are indeed hard to understand. If there is not some compensation hereafter, then the world is a cruel jest.