You know my method. It is founded upon the observation of trifles.

Anything is better than stagnation.

I have already explained to you that what is out of the common is usually a guide rather than a hindrance.

You will ruin no more lives as you ruined mine. You will wring no more hearts as you wrung mine. I will free the world of a poisonous thing. Take that, you hound, and that! - and that! - and that! - and that!

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 Adventure of the Noble Bachelor

‎A change of work is the best rest.