“I think the detective story is by far the best upholder of the democratic doctrine in literature. I mean, there couldn't have been detective stories until there were democracies, because the very foundation of the detective story is the thesis that if you're guilty you'll get it in the neck and if you're innocent you can't possibly be harmed. No matter who you are. There was no such conception of justice until after 1830. There was no such thing as a policeman or a detective in the world before 1830, because the modern conception of the policeman and detective, namely, a man whose only function is to find out who did it and then get the evidence that will punish him, did not exist. … In Paris before the year 1800 — read the Dumas stories — there were gangs of people whose business was to go out and punish wrongdoers. But why? Because they had hurt De Marillac or Richelieu or the Duke or some Huguenot noble, not just because they had harmed society. It is only the modern policeman that is out to protect society.”

Rex Stout, page 3
Royal Decree: Conversations with Rex Stout

Source: Peril at End House

Principles of Modern Chemistry (7th ed., 2012), Ch. 1 : The Atom in Modern Chemistry

The Oaken Heart

essay, first appeared in The Atlantic Monthly (November, 1945)
The Simple Art of Murder (1950)

Connections (1979), 1 - The Trigger Effect
Context: And that's why following the trail from the past up to the emergence of the modern technology that surrounds us in our daily lives, and affects our lives, is rather like a detective story. Because, at no time in the past, did anybody have anything to do with the business of inventing or changing things, ever know what the full effect of his actions would be. He just went ahead and did what he did for his own reasons, like we do. That's how change comes about. And it's like a detective story because if you follow the trail from the past up to a modern man-made object, the story is full of sudden twists and false clues and guesswork, and you never know where the story is heading until the very last minute.
Context: I would say it was a pretty safe bet, that the one magic wish most people would like to be granted would be to be able to see into the future. Think what it would mean. And backing the right horse! But we can't. We have to guess about tomorrow and we have to act on that guess, and it's never been any different. And that's why following the trail from the past up to the emergence of the modern technology that surrounds us in our daily lives, and affects our lives, is rather like a detective story. Because, at no time in the past, did anybody have anything to do with the business of inventing or changing things, ever know what the full effect of his actions would be. He just went ahead and did what he did for his own reasons, like we do. That's how change comes about. And it's like a detective story because if you follow the trail from the past up to a modern man-made object, the story is full of sudden twists and false clues and guesswork, and you never know where the story is heading until the very last minute.

Source: Century Rain (2004), Chapter 1 (p. 1)

Rex Stout, page 251
Invitation to Learning

Source: Red Mars (1992), Chapter 5, “Falling into History” (p. 276)