Poirot," I said. "I have been thinking." "An admirable exercise my friend. Continue it.
Unless you are good at guessing, it is not much use being a detective.
If anyone is really determined to lend you a book, you never can get out of it!
Everything that has existed, lingers in the Eternity.
There are more important things than finding the murderer. And justice is a fine word, but it is sometimes difficult to say exactly what one means by it. In my opinion, the important thing is to clear the innocent. - Hercule Poirot
If one sticks too rigidly to one's principles, one would hardly see anybody.