If theosis i.e. deification of the human person was the '"pre-eternal will" of God, which looked towards the Incarnation, it is clear that the "giving" of human nature by the Virgin Mary to the Son and Word of God was the highest goal of the entire Creation.
God willed that human nature be made divine. The Son who made all things descended from heaven and was "born of the Virgin Mary"Through her obedience--her "gift"-- the saints who came before and who came afterwards can follow him into the kingdom of heaven,i.e. can become divine--"like gods."