The great civilizations of the world are very different from one another, indeed more strangely different the closer they come in economic, social, and cultural interaction. Yet each claims to be a normative way of being human. At the very minimum human achievement requires competence in the conventions of one’s own civilization. To be human is to participate in a conventional culture, and the normatively human conventional cultures are different. Here is the “clash of civilizations”: Without commitment to some conventions of civilized humanity, no one can be human; yet the conventions are different, perhaps even opposed.