The plurality of cultures establishes a priori differentiation between men; it categorizes. Common sense, elevation of mind, rationality, show that men are certainly different in the way they eat, dress, talk, to judge, to see the future; But they are nevertheless citizens of the world because the world opens its borders to accommodate all his children from North to South, East to West. This way to live is to accept each other, share the sorrows and joys and consider that the company is one and indivisible.