"Democracy has no place for the kind of justice implied in an eye for an eye and a tooth for a tooth. Democracy is a system for the resolution of conflict, not for vengeance. Simple black-white notions of right and wrong do not fit into democratic politics. Political controversies result from the fact that the issues are complex, and men may properly have differences of opinion about them. The most terrible of all over-simplifications is the notion that politics is a contest between good people and bad people. Democracy is based on a profound insight into human nature, the realization that all men are sinful, all are imperfect, all are prejudiced, and none knows the whole truth. That is why we need liberty and why we have an obligation to hear all men. Liberty gives us a chance to learn from other people, to become aware of our own limitations, and to correct our bias. Even when we disagree with other people we like to think that they speak from good motives, and while we realize that all men are limited, we do not let ourselves imagine that any man is bad. Democracy is a political system for people who are not sure that they are right."