Culture.

It must certainly be admitted that man always exists in a particular culture, but it must also be admitted that man is not exhaustively defined by the same culture....The very progress of cultures demonstrates that there is something in man which transcends those cultures. This "something" is precisely Human nature: this nature is itself the measure of culture and the condition ensuring that man does not become the prisoner of any of  his cultures, but asserts his personal dignity by living in accordance with the profound truth of his being.