''A certain lunatic is convinced that all dons want to murder him. His friends introduce him to all the mildest and most respectable dons that they can find, and after each of them has retired, they say, "You see, he doesn't really want to murder you; he spoke to you in a most cordial manner; surely you are convinced now?" But the lunatic replies "Yes, but that was only his diabolical cunning; he's really plotting against me the whole time, like the rest of them; I know it I tell you." However, many kindly dons are produced, the reaction is the same.''