The Immaculate Conception
Mary conceived without sin
O Mary, conceived without sin, pray for us who have recourse to thee.
Life
ON this day, so dear to every Catholic heart, we celebrate, in the first place, the moment in which Almighty God showed Mary, through the distance of ages, to our first parents as the Virgin Mother of the divine Redeemer, the woman destined to crush the head of the serpent. And as by eternal decree she was miraculously exempt from all stain of original sin, and endowed with the richest treasures of grace and sanctity, it is meet that we should honor her glorious prerogatives by this special feast of the Immaculate Conception. We should join in spirit with the blessed in heaven, and rejoice with our dear Mother, not only for her own sake, but for ours, her children, who are partakers of her glory and happiness.
Secondly, we are called upon to celebrate that ever-memorable day, the 8th of December, 1854, which raised the Immaculate Conception of Our Blessed Lady from a pious belief to the dignity of a dogma of the Infallible Church, causing universal joy among the faithful.
From Pictorial Lives of the Saints
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The Immaculate Conception of the Blessed Virgin Mary
O God, who by the Immaculate Conception of the Blessed Virgin prepared a worthy dwelling for your Son,
grant, we pray,
that, as you preserved her from every stain
by virtue of the Death of your Son, which you foresaw, so, through her intercession,
we, too, may be cleansed and admitted to your presence. Through our Lord Jesus Christ, your Son,
who lives and reigns with you in the unity of the Holy Spirit,
one God, for ever and ever.