"The ability to ask the right question is more than half the battle of finding the answer." - Thomas J. Watson

"A problem well-defined is half solved." - John Dewey

This is why the author says that they are dangerous:

> The right questions set you up for real success or failure. You never know whether a clue leads down a bunny trail or to genuine insight.

>Hastings’ question is clear even if you know nothing about the book. [...] Poirot’s questions, on the other hand, only makes sense if you know something about the story.