O Jesus Living in Mary

O Jesus living in Mary, come and dwell in your servants in the spirit of your holiness, in the fulness of your power, in the perfection of your ways, in the truth of your virtues, in the communion of your mysteries. Subdue our enemies, the world and the flesh, in the strength of your Spirit, for the glory of your Father. Amen.

"So closely are they (Jesus and Mary) united that one is wholly in the other. Jesus is all in Mary and Mary is all in Jesus. Or rather it is no longer she who lives, but Jesus alone who lives in her. It would be easier to separate light from the sun than Mary from Jesus. So united are they, that our Lord may be called 'Jesus of Mary', and his Mother 'Mary of Jesus'...The Incarnation is the first mystery of Jesus Christ; it is the most hidden; and it is the most exalted and the least known.

It was in this mystery that Jesus, in the womb of Mary and with her co-operation, chose all the elect. For this reason the saints called her womb the throne-room of God's mysteries.

It was in this mystery that Jesus anticipated all subsequent mysteries of his life by his willing acceptance of them. Consequently, this mystery is a summary of all his mysteries, since it contains the intention and the grace of them all.

Lastly, this mystery is the seat of the mercy, the liberality, and the glory of God. It is the seat of his mercy for us, since we can approach and speak to Jesus through Mary. We need her intervention to see or speak to him. Here, ever responsive to the prayer of his Mother, Jesus unfailingly grants grace and mercy to all poor sinners. 'Let us come boldly then before the throne of grace.'"
from True Devotion to the Blessed Virgin Mary paragraphs 247-248 by St. Louis Marie de Montfort