I've always believed in writing without a collaborator, because where two people are writing the same book, each believes he gets all the worry and only half the royalties.

Speech ... is an invention of man's to prevent him from thinking.

Never worry about what you say to a man. They're so conceited that they never believe you mean it if it's unflattering.

Any coincidencce is worth noticing. You can throw it away later if it is only a coincidence.

One place is very like another.

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

I've always noticed that if you speak the truth in a rather silly way nobody believes you.