Adam Clarke on Deuteronomy 7:8

But because the Lord loved you - It was no good in them that induced God to choose them at this time to be his peculiar people: he had his reasons, but these sprang from his infinite goodness. He intended to make a full discovery of his goodness to the world, and this must have a commencement in some particular place, and among some people. He chose that time, and he chose the Jewish people; but not because of their goodness or holiness.