Cor Jesu, in Sinu Virginis Matris a Spiritu Sancto Formatum

Heart of Jesus, formed by the Holy Spirit in the womb of the Virgin Mary,
have mercy on us.

Et Homo Factus Est
The second invocation of the Litany of the Sacred Heart is the only one to mention the Holy Spirit, and the only one to name the Blessed Virgin Mary. In this, the Litany echoes the Nicene Creed: Who for us men and for our salvation, came down from heaven. And was incarnate by the Holy Spirit of the Virgin Mary; and was made man. When these words occur in the liturgy, the Church instructs us to bow profoundly (or to kneel) in adoration of the mystery of the Incarnation. So often as we perform this liturgical action, it unites us, in some way, to the first act of adoration offered by the Virgin Mary to the Sacred Heart.
The Sound of Redeeming Love
After twenty–four days, the Heart of Jesus, formed by the Holy Spirit in the womb of the Virgin Mary, began to have regular beats or pulsations. The human Heart of God began to beat beneath the Immaculate Heart of Mary. It was the sound of redeeming love. “When the time had fully come, God sent forth His Son, born of a woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons. And because you are sons, God has sent the Spirit of His Son into our hearts, crying, ‘Abba! Father’ ” (Gal 4:6-7).
Keeper of the Mystic Portal
It is through the Blessed Virgin Mary that the Sacred Heart of Jesus enters the world. It is through her that the world will be brought to the Sacred Heart. I have never known anyone to have loved Mary without loving the Heart of Jesus, and I have never known anyone to have loved the Heart of Jesus without loving Mary. Mary is the Keeper of the Mystic Portal; she stands at the foot of the Cross drawing souls to the pierced Side of her Son, and guiding them over the threshold of His Pierced Side into the secret abode of His Sacred Heart.
Blessed Marie de Jésus Deluil–Martiny writes: “In this life of union with the Heart of Jesus, of imitation of the Heart of Jesus, their excellent model is the Heart of Mary, for the Mother cannot be separated from the Son. It is through Mary that every soul goes to Jesus. Having once given His only Son through Mary, it is still through her that ceaselessly God gives Him to us.”
I pray thee, O Most Holy Virgin Mary,
that I might hear the Heartbeat of redeeming Love,
and that with Thee
I might adore the Heart of Jesus
formed in Thy womb by the Holy Spirit.
Through the Holy Spirit,
by whose power and overshadowing Thou didst become
the living tabernacle of the Heart of God,
may my soul rejoice in Thy every visitation
and leap in recognition of Him
who through Thee deigns to come to me.
Through the Holy Spirit
by whom Thou wert illumined by faith,
quickened by hope,
and inflamed with charity,
grant that I may believe all that the Sacred Heart of Jesus has revealed,
never despair of His boundless Mercy,
and burn with the fire He came to cast upon the earth.
In the Holy Spirit,
Thou adorest the Heart of Thy Son as the Heart of Thy God;
in that same Holy Spirit,
grant that I may adore the Heart of my God
as the Heart that, hidden in Thy womb, once beat beneath Thy own:
the same Sacred Heart that, pierced upon the Cross,
fills the heavens with glory
and the earth with mercy.