The Blessed Virgin received the Holy Spirit with a unique fullness on the day of Pentecost, because her heart was the purest, the most detached, and the one that loved the Most Holy Trinity in an incomparable way. The Paraclete descended upon the soul of the Virgin and flooded her in a new way. He is the "sweet Guest" of Mary's soul. Our Lord had promised to whoever loves God: We will come to him and make our dwelling in him [8]. This promise is fulfilled, above all, in Our Lady.
She, "God's masterpiece" [9], had been prepared with immense care by the Holy Spirit to be the living tabernacle of the Son of God. That is why the Angel greets her: Hail, full of grace [10]. And already possessed by the Holy Spirit and filled with His grace, she still received a new and singular fullness of it: The Holy Spirit will come upon you and overshadow you [11]. "Redeemed in an eminent manner, in anticipation of the merits of her Son, and united to Him by a close and indissoluble bond, she is enriched with the supreme prerogative and dignity of being the Mother of God the Son, and therefore, the beloved Daughter of the Father and the Tabernacle of the Holy Spirit; with the gift of such an extraordinary grace that it far surpasses all creatures, both celestial and earthly" [12].
During her life, Our Lady grew in love for God the Father, God the Son (her Son Jesus), and God the Holy Spirit. She responded to all the inspirations and promptings of the Paraclete, and every time she was docile to these inspirations, she received new graces. At no moment did she offer the slightest resistance, she never denied anything to God; her growth in supernatural and human virtues (which were under a special influence of grace) was continuous.
Those who are moved by the Spirit of God are sons of God [13]. No creature allowed herself to be led and guided by the Holy Spirit like our Mother Saint Mary: no one lived divine filiation as She did.
The Holy Spirit, who has dwelt in Mary since the mystery of her Immaculate Conception, came to establish His dwelling in Her in a new way on the day of Pentecost. All the promises that Jesus had made regarding the Paraclete are fully fulfilled in the soul of the Virgin: He will remind you of all things [14]. He will guide you into all truth [15].
The Virgin is God's most beloved Creature. For if He receives us—despite so many offenses—like the father receives the prodigal son; if He loves us, being sinners, with an infinite love and fills us with good things every time we respond to His graces, "if He acts this way toward the one who has offended Him, what will He do to honor His Mother, immaculate, Virgo fidelis, Most Holy Virgin, ever faithful?
"If God's love shows itself to be so great when the capacity of the human heart—often a traitor—is so small, what will it be like in the Heart of Mary, which never placed the slightest obstacle to the Will of God?" [16].
HCD