A realistic analysis of the problems of human society reveals a constant and seemingly irreconcilable conflict between the needs of society and the imperatives of a sensitive conscience. This conflict, which could be most briefly defined as the conflict between ethics and politics, is made inevitable by the double focus of the moral life. One focus is in the inner life of the individual, and the other in the necessities of man’s social life. From the perspective of society the highest moral ideal is justice. From the perspective of the individual the highest ideal is unselfishness. Society must strive for justice even if it is forced to use means, such as self-assertion, resistance, coercion and perhaps resentment, which cannot gain the moral sanction of the most sensitive moral spirit. The individual must strive to realize his life by losing and finding himself in something greater than himself.
Reinhold Niebuhr, Moral Man and Immoral Society: A Study in Ethics and Politics, 257.