Our civilized world is nothing but a great masquerade. You encounter knights, parsons, soldiers, doctors, lawyers, priests, philosophers and a thousand more: but they are not what they appear - they are merely masks... Usually, as I say, there is nothing but industrialists, businessmen and speculators concealed behind all these masks.
The doctor learns that if he gets ahead of the superstitions of his patients he is a ruined man; and the result is that he instinctively takes care not to get ahead of them.