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 most difficult crime to track is the one which is purposeless.

It was all love on my side, and all good comradeship and friendship on hers. When we parted she was a free woman, but I could never again be a free man.

Work is the best antidote to sorrow, my dear Watson.

I wanted to end the world but,I'll settle for ending yours.

The weak man becomes strong when he has nothing, for then only can he feel the wild, mad thrill of despair.

Depend upon it, there is nothing so unnatural as the commonplace.