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

Everything must be taken into account. If the fact will not fit the theory---let the theory go.

It is really a hard life. Men will not be nice to you if you are not good-looking, and women will not be nice to you if you are.

Unless you are good at guessing, it is not much use being a detective.

To every problem, there is a most simple solution.

Most successes are unhappy. That's why they are successes - they have to reassure themselves about themselves by achieving something that the world will notice.

It is odd how, when you have a secret belief of your own which you do not wish to acknowledge, the voicing of it by someone else will rouse you to a fury of denial.