To affirm that humans thrive in many different ways is not to deny that there are universal human values. Nor is it to reject the claim that there should be universal human rights. It is to deny that universal values can only be fully realized in a universal regime. Human rights can be respected in a variety of regimes, liberal and otherwise. Universal human rights are not an ideal constitution for a single regime throughout the world, but a set of minimum standards for peaceful coexistence among regimes that will always remain different.

Two Faces of Liberalism (New Press, 2000, ISBN 0-745-62259-3. 168 pages), ch. 1: Liberal Toleration (p. 21)