Richard Rorty, "Postmodernist Bourgeois Liberalism", The Journal of Philosophy, Vol. 80, No. 10 (Oct., 1983), pp. 583-589. Reprinted in Postmodernism: A Reader, edited by Thomas Docherty.
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This Jewish and Christian element in our tradition is gratefully invoked by free-loading atheists like myself ... The existence of human rights, in the sense in which it is at issue in this meta-ethical debate, has as much or as little relevance to our treatment of such a child as the question of the existence of God.