Remembering always that Paradise Lost is a poem, note the structure of lines 56 through 79 as God looks down at his creation. God starts by seeing all the good things, including his creation of Adam and Eve. Then he pans over to hell and chaos, and finally to Satan himself flying toward Paradise. The paragraph gives equal time to nature as pure and nature as corrupted. Sentences in the middle of these two equal parts deal with love. Therefore, the subdialogue is that love is what divides corrupted nature from pure nature. This circular paragraph structure, with a discussion literally circulating around one theme (in this case love) is a poetic tool employed by Milton throughout the story.
Michael then explains what else is to come, including the story of Nimrod building the irreligious Babel, and the faithful Abraham who is promised land by God to start a new community and whose work is continued by Isaac, Jacob and Moses. Michael also reassures Adam that Jesus Christ, born of a virgin, will overcome Satan and Death through his own crucifixion and so, comforted about the future, Adam and Eve are led out of Paradise: