Praying for the souls in purgatory, and helping them reach heaven is a simple enough thing to do - and one that I don't often remember to do. But, today on All Soul's Day, we remember.
There is a prayer that Our Lord revealed to St. Gertrude the Great. He told her that the following prayer would release 1000 souls from purgatory each time it is said.
"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."