To every problem, there is a most simple solution.

We owe most of our great inventions and most of the achievements of genius to idleness either enforced or voluntary.

It often seems to me that's all detective work is, wiping out your false starts and beginning again." Yes, it is very true, that. And it is just what some people will not do. They conceive a certain theory, and everything has to fit into that theory. If one little fact will not fit it, they throw it aside. But it is always the facts that will not fit in that are significant.

Any woman can fool a man if she wants to and if he's in love with her.

He laughs best who laughs at the end.

It is ridiculous to set a detective story in New York City. New York City is itself a detective story.

One never quite allows for the moron in our midst.