A culture lasts, although individual men in the group die off. On the other hand, a culture changes as the different conventions and understandings change. You could almost say that a culture lives in the minds of the men who have it. But people are not born with it; they get it as they grow up. Suppose a day-old Hungarian baby is adopted by a family in Oshkosh, Wisconsin, and the child is not told that he is Hungarian. He will grow up with no more idea of Hungarian culture than anyone else in Oshkosh.The main theme of this passage is