In the Old Testament Age, they sacrificed material things to pave the way for the coming of the true son. Jesus came as the son and sacrificed himself to pave the way for the coming of the parents. The True Parents come on this level plane, and walk a suffering path in order to invite God in. To what position do they come? To the original, vertical place. Since the original, great principle of heaven and earth was cut off from that point, peace cannot begin as long as that fundamental root is not rectified. This is absolute.