The Chachomim explain that all sevenths are cherished. This is the reason, they explain, why Moshe was the one who merited to bring Hashems Presence into this world because he was the seventh from Avraham. The fact that the seventh is cherished indicates the greatness of the first. What was the unique quality of Avraham? Avraham served Hashem with self-sacrifice. He called out in the Name of Hashem, Master of the world the Chachomim explain: Not, he called out, but rather he brought others to call out. This self-sacrifice is expected from each of us in the seventh generation. Even if one feels no spiritual strengths within himself, he is nevertheless told: It is not by your own choice that you are the seventh generation you have the strength by the very fact that you are the seventh. You must realize how cherished you are, and how much has been invested in you. You will then fulfill your part in the mission to draw Hashems essence into this material world.