The function of Man is to perfect a world which was created imperfectly, a world where the spirituality of G-d becomes evident. With Adam's failure to do this, the onus has fallen upon mankind as a whole to do it. Generation after generation we must work to reveal G-d's presence. Man must simultaneously stop the downward trend of spirituality, and join the upward trend. The Messianic era is when man has finally fixed all the damage first introduced by Adam. We are constantly improving our world and making it greater, because we are much closer to the elevation.