The tendency to claim God as an ally for our partisan value and ends is the source of all religious fanaticism.
Reinhold NiebuhrThe chief source of man's inhumanity to man seems to be the tribal limits of his sense of obligation to other men.
Reinhold NiebuhrThe history of mankind is a perennial tragedy; for the highest ideals which the individual may project are ideals which he can never realize in social and collective terms.
Reinhold Niebuhr