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

Never tell all you know—not even to the person you know best.

In old days the public didn't really mind much about accuracy, but nowadays readers take it upon themselves to write to authors on every possible occasion, pointing out flaws.

I am not one to rely upon the expert procedure. It is the psychology I seek, not the fingerprint or the cigarette ash.

Evil is not any superhuman, but it is HUMAN.

To put it quite crudely ... the poor don't really know how the rich live, and the rich don't know how the poor live, and to find out is really enchanting to both of them.

And, of course, afterwards -- one always hears these things afterwards, so much better if one heard them before -- we found out that dozens of empty brandy bottles were taken out of the house every week!