This prayer is attributed to St. Mechtilde
OUR FATHER, WHO ART IN HEAVEN: I beseech you, O Heavenly Father, pardon the Souls in Purgatory, for they did not love you sufficiently, nor render to you all the honor which is your due, due to you their Lord and Father, Who, by pure grace, have adopted them as your children. By their sins, rather, have they driven you from their souls, where you, none the less, wished always to live. In reparation for these faults, I offer you the love and veneration which your Incarnate Son showed you all during his earthly life, and I offer all the acts of penance and satisfaction which he performed and by which he effaced and atoned for the sins of men.
HALLOWED BE THY NAME: I beg you, O father Most Good, pardon the Souls in Purgatory, for they did not honor, always and fittingly, your Holy Name, but often they took it in vain and proved unworthy of the name "Christian," by their lives of sin. In reparation for their faults, I offer to you all the honor which your Well-Beloved Son rendered to Your Name by his words and deeds.
THY KINGDOM COME: I pray you, Father Most Good, pardon the Souls in Purgatory, for they did not always seek or adore your Kingdom with enough fervor and diligence; this Kingdom, the only place where true rest and peace reign. In reparation for their omissions, through indifference to do what is good, I offer you the Most Holy Desire of Your Son, by which he wished that they also might become heirs to his Kingdom.
THY WILL BE DONE ON EARTH AS IT IS IN HEAVEN: I pray you, Father Most Good, pardon the Souls in Purgatory, for they did not always submit their will to your will. In reparation for their disobedience, I offer you the perfect conformity of the heart, full of love, of your Divine Son with your holy will and the most profound submission which he showed in obeying you unto death on the Cross.
GIVE US THIS DAY OUR DAILY BREAD:I pray you, Father Most Good, pardon the Souls in Purgatory, for they did not always receive the Holy Sacrament of the Eucharist with enough desire, but often without contemplation, or love, or even unworthily, or they neglected to receive it. In reparation for these faults, I offer you the outstanding holiness and the great contemplation of Our Lord Jesus Christ, your Divine Son, addressed to you in favor of his enemies when he was on the Cross.
FORGIVE US OUR TRESPASSES AS WE FORGIVE THOSE WHO TRESPASS AGAINST US: I pray you, Father Most Good, pardon the Souls in Purgatory, all the faults of which they have been guilty through succumbing to the seven capital sins and also in not having wished either to love or pardon their enemies. In reparation for these faults, I offer you the outstanding holiness and the great contemplation of Our Lord Jesus Christ, your Divine Son, addressed to you in favor of his enemies when he was on the Cross.
AND LEAD US NOT INTO TEMPTATION: I pray you, Father Most Good, pardon the Souls in Purgatory, because too often they did not resist temptations and the passions, but they followed the enemy of all goodness. In reparation for all these sins, in thought, word, and deed. I offer you the glorious victory which Our Lord won against the world, as well as his most holy life, his work and sorrows, his suffering and his most cruel death.
BUT DELIVER US FROM EVIL: and from all punishment through the infinite merits of your well-beloved Son and lead us, as well as the Souls in Purgatory, into your Kingdom of eternal glory. Amen.
Peace be with you!
Rosemarie of the Hearts of Jesus and Mary, ocds