O GOD, who through the immaculate conception of the Virgin didst prepare a worthy dwelling-place for Thy divine Son; grant that, as in view of Thy Son Thou didst preserve her from all taint, so Thou wouldst vouchsafe unto us that cleansed from all sin by her intercession we too may arrive at Thine eternal glory. Through the same Christ our Lord. Amen.
Prayer
BEHOLD, Virgin immaculate, at thy sacred feet I bow, while my heart overflows with joy in union with thine own, because from eternity thou wast the Mother-elect of the eternal Word, and was preserved stainless from the taint of Adam's sin. Forever praised, forever blessed be the Most Holy Trinity, who in thy conception poured out upon thy soul the riches of that matchless privilege. I humbly pray thee, most gracious Mother, obtain for me the grace to overcome the bitter results of original sin. Make me victorious over them, that I may never cease to love my God.
Hail Mary, etc.
O Mary, conceived without sin, pray for us who have recourse to thee!
Indulgence. 100 days, once a day. (Leo XIII, March 25, 1884.)