142. What is the work of the Spirit in Mary?

The Holy Spirit brought to fulfillment in Mary all the waiting and the preparation of the Old Testament for the coming of Christ. In a singular way he filled her with grace and made her virginity fruitful so that she could give birth to the Son of God made flesh. He made her the Mother of the “whole Christ”, that is, of Jesus the Head and of the Church his body. Mary was present with the twelve on the day of Pentecost when the Holy Spirit inaugurated the “last days” with the manifestation of the Church.