Traditionally, the idea of the frailty of man led to the demand for obedience to ordained authority. But Niebuhr rejected that ancient conservative argument. Ordained authority, he showed, is all the more subject to the temptations of self-interest, self-deception and self-righteousness. Power must be balanced by power. He persuaded me and many of my contemporaries that original sin provides a far stronger foundation for freedom and self-government than illusions about human perfectibility. Niebuhr's analysis was grounded in the Christianity of Augustine and Calvin, but he had, nonetheless, a special affinity with secular circles. His warnings against utopianism, messianism and perfectionism strike a chord today. ... We cannot play the role of God to history, and we must strive as best we can to attain decency, clarity and proximate justice in an ambiguous world.