"Why should a government secretly place a watch over its citizens? In order that they may not believe themselves watched. But why should they not believe themselves watched? That they may discover their thoughts respecting the government and its plans, and may thus become their own betrayers; or may betray whatever they know of other secret and illegal acts. The former is necessary only where government and citizens live in perpetual war with each other; where the citizens are unjustly oppressed, and seek to regain their freedom again by employing all the means and tricks of war: the latter is necessary only where the police are not watchful enough."