Waverly - "That policeman is a fool!"Most of us do have our own little policeman and that is fortunate because without it freedom could not coexist with order. Order would prevail and freedom would be lost.
Poirot - "Ah, no. Japp is a good policeman. Prevention of crime is not what policemen are good at. They would have to have one constable for every citizen and go everywhere with him. But, fortunately for the human race, most of us have our own policeman up here (pointing to his forehead). This kidnapper has, perhaps, no little policeman."