An Invocation to the Most Holy Trinity for the Souls in Purgatory
O God, all goodness, Father of mercies, Who at the prayers and fastings of your faithful people, did vouchsafe to send your angels to break the chains of your holy apostle Peter, and to open the doors of his prison; here even also on this day the prayers and supplications of your church, and send you angel to the souls for whom we pray, that, the doors of their prison being opened wide, they may be happily received into the bosom of your mercy.
Our Father... Hail Mary... Glory be...
O Son of God, Savior of souls, who refreshed the three children in the fiery furnace, pour down upon the souls that cry to you from the flames, your heavenly dew. Your precious blood alone can quench the flames of purgatory; oh, let it now flow down upon these suffering souls and do Thou, O Lord, have mercy upon them.
Our Father... Hail Mary... Glory be...
O Spirit of love, have compassion on the cruel torment which these souls endure, that are filled with the purest charity, and, aspiring without ceasing towards their God, cry aloud in their distress, "I thirst, I thirst after my God!" -- and yet cannot attain unto the object of their love, nor receive the least drop of that torrent of pure delights. O Holy Spirit, grant that, having felt the fiercest pangs of love, they may taste its heavenly delights in a blessed eternity. Amen.
Our Father... Hail Mary... Glory be...
(Susan Tassone, Praying in the Presence of Our Lord for the Holy Souls. p. 106)
