Human responsibility and the growth period
Before Adam and Eve committed the Fall, certain responsibility had been given only to them. Had they fulfilled this and emerged as the True Parents, they would have been welcomed by all subsequent generations of parents. Then no such being as Satan could have interfered, because there would have been nothing for Satan to accuse. This would have been the reality for Adam and Eve had they not fallen. However, to this day there have been no perfected Adam and Eve, and their absence has affected even aspect of human life throughout history. Therefore, human beings in the fallen world have been eagerly awaiting the coming of the True Parents, and even those who have passed into the spiritual world have been eagerly anticipating the day of the Second Advent.
This you should clearly understand.
Sun Myung Moon, Cheon Seong Gyeong (4-2-2)
Divine Principle video
The Reason why God did not intervene in the Fall
For a deeper understanding of the The Motivation of the Process of the Fall, check the Exposition of the Divine Principle (page 76 to 78) in our web's library.
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