“The work of the philosophical policeman," replied the man in blue, "is at once bolder and more subtle than that of the ordinary detective. The ordinary detective goes to pot-houses to arrest thieves; we go to artistic tea-parties to detect pessimists. The ordinary detective discovers from a ledger or a diary that a crime has been committed. We discover from a book of sonnets that a crime will be committed. We have to trace the origin of those dreadful thoughts that drive men on at last to intellectual fanaticism and intellectual crime. We were only just in time to prevent the assassination at Hartlepool, and that was entirely due to the fact that our Mr. Wilks (a smart young fellow) thoroughly understood a triolet.”

“The criminal is the creative artist; the detective only the critic.”

“He thought his detective brain as good as the criminal's, which was true. But he fully realised the disadvantage. "The criminal is the creative artist; the detective only the critic," he said with a sour smile, and lifted his coffee cup to his lips slowly, and put it down very quickly. He had put salt in it.”

“A detective story generally describes six living men discussing how it is that a man is dead. A modern philosophic story generally describes six dead men discussing how any man can possibly be alive.”

“It has been often said, very truly, that religion is the thing that makes the ordinary man feel extraordinary; it is an equally important truth that religion is the thing that makes the extraordinary man feel ordinary.”

“The most extraordinary thing in the world is an ordinary man and an ordinary woman and their ordinary children.”

“The horrible thing about all legal officials, even the best, about all judges, magistrates, barristers, detectives, and policeman, is not that they are wicked (some of them are good), not that they are stupid (several of them are quite intelligent), it is simply that they have got used to it. Strictly they do not see the prisoner in the dock; all they see is the usual man in the usual place. They do not see the awful court of judgment; they only see their own workshop.”