The grand thing is to be able to reason backwards.

Come, Watson, come!" he cried. The game is afoot.

You will, I am sure, agree with me that... if page 534 only finds us in the second chapter, the length of the first one must have been really intolerable.

Everything comes in circles. [...] The old wheel turns, and the same spoke comes up. It's all been done before, and will be again.

What one man can invent, another can discover.

Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.

I think you want a little unofficial help. Three undetected murders in one year won't do, Lestrade. But you handled the Molesey Mystery with less than your usual - that's to say, you handled it fairly well.