Let us compare, for example, the emphasis of the ethical one in true the moral beliefs, from the following affirmation of anthropologist Wllian Summer: ' ' It is of the biggest importance to observe that since the first acts through which the man tries to satisfy necessities, each one of them is supported by itself and seno is not worried about the immediate satisfaction. Of the repetitive necessities habits for the individual and customs for the group appear, but these results are not foreseen or intended a raised period of training more of mental development it can be reached, before these consequncias can be taken by base from which if they deduce rules to face, in the future, previsible problems. The customs of the people, therefore, are not creations of the intention or the human device. They are similar results of natural forces, that the men unconsciously put in march transmitted by the tradition. They do not admit variation, and even so they move to face new situations, they keep the same methods limited and without reflection or rational intention ' '.
It observes two implications in this affirmation that defy the emphasis of the ethical one in the moral truth. In first place, the practical moral are changeable and depend on the necessities human beings and the social conditions. In according to place, the attitudes and practical moral are basically answers not cognitiva, and they do not result of a rational aiming. This opinion surpasses the primitive customs and encloses modern cultures and its moral codes. The cultural relativismo is the point of view according to which the beliefs and practical moral vary with the necessities human beings and the social conditions of each culture, in way that no moral belief can universally be true. They cannot exist ' ' deveres' ' universal. d) The thesis of the diversity Practical and the moral beliefs in fact vary of culture for culture and without different phases of History, and none of them is universal.