Huntington forecasts a risk of the clash of civilizations in world order. Multiculturalism has cast a shadow over the orders of some states. The various order of societies are on the verge of the split. The pupose of this paper is to show that the diversity of cultures does not mean at once the relativity of ethics, that it is only Bonum Commune based on natural law that prevents the diversity of societies from causing clefts and secures the unity of orde