"Plato, too, knew the “underground”, but her called it a “cave” and created his splendid world-famous myth in which men were likened to prisoners in a cave. But he did it in such a way that no one thought of calling Plato’s cave “underground” nor calling Plato himself a sickly, abnormal being, one of those for whom normal men have to invent theories, treatments, etc. p. 13"