The fundamental thesis of Koselleck is that modernity has progressively increased the difference between experience (recollection, memory) and expectation (plan, hope); or more precisely, modernity can only be conceived as a new time, since expectations have increasingly distanced themselves from experiences. The tension is what provokes new solutions in a different manner each time, pushing historic time this way from itself. Both constitute a temporal difference in the present, each interweaving the past and future unequally. Modernity and historical change co-ordinate experience and expectation. They represent the fact that the future not only modifies but also perfects society, characterizing the horizon of expectations outlined by the late Enlightenment, which was qualified and conceptualized around the idea of progress, in that modernization breaks away from orientation toward the future with regard to its past. That is, the experience of progress emerges as the new historical experience with respect to the rooted experience of past tradition.