Now forty years old, Wittgenstein returned for a short while to Cambridge and at long last earned his doctorate in philosophy. For his PhD thesis, he submitted the now world-famous Tractatus. His examiners were Professors Russell and Moore, his old friends from the prewar years. The oral defense seemed like a farce to all three, and it was brief. As the story goes, Wittgenstein got up after a few minutes, patronizingly patted the shoulders of his examiners, and said: “Don’t worry, you’ll never understand it.”

— Exact thinking in demented times by Karl Sigmund (Page 135)