By a Brief of September 30, 1859, the Sovereign Pontiff Pius IX. granted -
The indulgence of 300 days to all faithful Christians, who shall with contrite hearts devoutly say in any language at the beginning of the day the following offering: O Lord God Almighty, &c. He granted also another indulgence of 300 days to any one who at the time of the holy Mass shall say the other offering printed below: Eternal Father, I offer to Thee, &c. Moreover to those who shall have said both the prayers every day for a month he granted -
The plenary indulgence, provided that, being truly penitent, having Confessed and Communicated, they visit their own parish church, or any other church, and pray according to the intention of his Holiness.
By another Brief, dated April 11, 1860, the same Sovereign Pontiff vouchsafed to extend the above-mentioned partial Indulgence of 300 days to three years.
THE OFFERING TO BE MADE AT THE BEGINNING OF THE DAY.
O Lord God Almighty, behold me prostrate be fore Thee in order to appease Thee, and to honour Thy Divine Majesty, in the name of all creatures. But how can I do this who am myself but a poor sinner? Nay, but I both can and will, knowing that Thou dost make it Thy boast to be called Father of mercies, and for love of us hast given Thy very only-begotten Son, who sacrificed Himself upon the Cross, and for our sake doth continually renew that sacrifice of Himself upon our altars. And therefore do I - sinner, but penitent; poor, but rich in Jesus Christ - present myself before Thee, and, with the ardent love of angels and of all Thy saints, and with the tender affection of the Immaculate Heart of Mary, offer to Thee in the name of all creatures the Masses which are now being celebrated, together with all those which have been celebrated, and which will be celebrated to the end of the world. Moreover, I intend to renew the offering of them every moment of this day and of all my life, that I may thereby render to Thy infinite Majesty an honour and a glory worthy of Thee, thus to appease Thy indignation, to satisfy Thy justice for so many sins of us thy children, to render Thee thanks proportioned to Thy benefits, and to implore Thy miseries upon myself and upon all sinners; upon all the faithful, living and dead, upon Thy whole Church, and principally upon its visible Head, the Sovereign Pontiff of Rome; and lastly upon all poor schismatics, heretics, and infidels, that they also may be all converted and save their souls.
THE OFFERING TO BE MADE AT THE TIME OF THE HOLY MASS.
Eternal Father, I offer to Thee the sacrifice which Thy beloved Son Jesus made of Himself upon the Cross, and now renews upon this altar; and I offer it to Thee in the name of all creatures, together with the Masses which have been celebrated, and which shall be celebrated, in the whole world, in order to adore Thee, and to give Thee the honour which Thou dost deserve; to render to Thee due thanks for Thy innumerable benefits, to appease Thy anger for our sins, and to give Thee due satisfaction for them; to entreat Thee also for myself, for the Church, for the whole world, and for the blessed souls in purgatory. Amen.
http://www.franciscan-sfo.org/ap/rac/almighty.htm#8
