St. Alphonsus Liguori on Praying for the Holy Souls

The practice of recommending to God the souls in Purgatory, that He may mitigate the great pains which they suffer, and that He may soon bring them to His glory, is most pleasing to the Lord and most profitable to us. For these blessed souls are His eternal spouses, and most grateful are they to those who obtain their deliverance from prison, or even a mitigation of their torments. When, therefore, they arrive in Heaven, they will be sure to remember all who have prayed for them.

— St. Alphonsus Liguori 

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Prayer to Release Souls from Purgatory

Our Lord told St. Gertrude the Great, that the following prayer would release 1,000 souls from Purgatory each time it is said. The prayer was extended to include living sinners which would alleviate the indebtedness accrued to them:

Eternal Father, I offer Thee the Most Precious Blood of Thy Divine Son, Jesus, in union with the Masses said throughout the world today, for all the Holy Souls in Purgatory, for sinners everywhere, for sinners in the Universal Church, those in my own home and within my family. Amen. [Poor souls, upon attaining heaven, pray that I may also experience holy beatitude at the close of my earthly life.]