It is my strong conviction that a realist conception of human nature should be made a servant of an ethic of progressive justice and should not be made into a bastion of conservatism, particularly a conservatism which defends unjust privileges.
Reinhold Niebuhr (2012). “Man's Nature and His Communities: Essays on the Dynamics and Enigmas of Man's Personal and Social Existence”, p.24, Wipf and Stock Publishers
