Man can only be defined each time as a set of needs and corresponding objects, but he always exceeds these definitions - and, if it transcends them (not only in a perpetual force, but in the reality of historical motion), it is because they come out of themselves, because it invents them (not arbitrarily, of course, there is always nature, the minimum of coherence it requires). logic, and previous history), because therefore them who floating, and floating him himself and because no logical, physical or historical definition allows their definitive consolidation . << Man is what he is not what he is, and where he is what he is not >>, Hegel was already saying.