In the midst of the second world war Pope Pius XII put the whole world under the special protection of our Savior's Mother by consecrating it to her Immaculate Heart, and in 1944 he decreed that in the future the whole Church should celebrate the feast of the Immaculate Heart of Mary. This is not a new devotion. In the seventeenth century, St. John Eudes preached it together with that of the Sacred Heart; in the nineteenth century, Pius VII and Pius IX allowed several churches to celebrate a feast of the Pure Heart of Mary. Pius XII instituted today's feast of the Immaculate Heart of Mary for the whole Church, so as to obtain by her intercession "peace among nations, freedom for the Church, the conversion of sinners, the love of purity and the practice of virtue" (Decree of May 4, 1944).
Oremus . Let us prayHeart of Mary ever Virgin, you are full of grace.
You are the dearest daughter of the heavenly Father,
the tabernacle of the Word made Flesh,
and the beloved home of the Holy Spirit.
You are the wonder and delight of angels,
of saints, and of men.
I offer you my deepest reverence.
With great love and thanksgiving I consecrate myself,
body and soul, to you this day,
and will never take back my word.
You are the marvel of God's creation;
a Virgin's heart, yet a Mother's too,
with a mother's love of Jesus and of men.
Dear Mother, fashion in my heart a child's true love of you.
Fill me with your own bright virtues:
simplicity and innocence,
meekness and courage,
and unfailing devotedness
to Jesus Christ.
Since I belong to you then, holy Mother,
save me from my enemies,
from the world, from Satan, from myself.
Keep me always in your sinless Heart
to make my poor heart more and more
like your Heart and the Heart of Jesus.
Dear, merciful Mother,
look with a mother's love and pity on the poor,
sinful, suffering children of the whole human family.
Our Holy Father Pius XII has consecrated them to your Immaculate Heart.
Do not turn them away.
Remember the cruel pain your heart
suffered for their salvation with Jesus Christ on Calvary.
Save them by His precious Blood.
Draw them out of the darkness and despair
of their sin and misery into the light, peace,
and holiness of the Church.
Then with the angels and saints,
may they join us in singing the everlasting Magnificat of praise,
gratitude, and love to your tender
and Immaculate Heart,
and to the adorable and merciful Heart of Jesus.Amen.