Although our practical duty involves resistance to evil, it should be clear that such resistance is itself an evil, but it is the lesser of two evils and a necessary result of the imperfect side of human nature today. It plays the same part in each individual's life that a police force plays in the social life. The presence of the policeman is an indication of the presence of the criminal. With the development of human character, criminal tendencies would disappear and with them police forces. But we cannot anticipate that time so far as the immediate present is concerned, although we ought to deal with the crime in the most enlightened way possible.
-- Notebooks Category 11: The Negatives > Chapter 3: Their Presence in The World > # 40