Ambrose of Milan : Thus the saints go up to the Lord, the wicked go down to sin; the saints are on the mountains, the guilty in the valleys. "For he is the God of the mountains and not the God of the valleys." Those who dwelt in the houses of the plain where God does not dwell could not have the house of God within them, for this is the house that God sought from them so that they might build up themselves and rear within themselves the temple of God from living stones of faith. He did not want buildings made with earthen walls or wooden roofs, for the hand of an enemy would have been able to overthrow them. He wanted that temple that is built in human hearts, to whom it might be said, "You are the temple of God," in which the Lord Jesus might dwell and from there set out to redeem all humankind. There also could be prepared a sacred chamber in the womb of the Virgin where the King of heaven might live and a human body become the temple of God, which, though it was destroyed, might yet be restored to life on the third day. — LETTER 80