A philosopher once had the following dream.
First Aristotle appeared, and the philosopher said to him, “Could you give me a fifteen-minute capsule sketch of your entire philosophy?” To the philosopher’s surprise, Aristotle gave him an excellent exposition in which he compressed an enormous amount of material into a mere fifteen minutes. But then the philosopher raised a certain objection which Aristotle couldn’t answer. Confounded, Aristotle disappeared.
Then Plato appeared. The same thing happened again, and the philosophers’ objection to Plato was the same as his objection to Aristotle. Plato also couldn’t answer it and disappeared.