man’s collective life.”18 Niebuhr reminded Christians that we do not live in a world in which sin can be eliminated, but we nonetheless must seek to establish the tentative harmonies and provisional equities possible in any historical situation. Niebuhr, who prided himself in being a sober realist challenging what he took to be the unfounded optimism of liberal thinkers such as John Dewey, would have in a like manner called into question the optimism of the story Hart associates with the celebration,
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