Help the Holy Souls and they will help you.

"Meeting Between Dante and Beatrice in Purgatory" by Andrea Pierini

Picture source

"Now who can be in more urgent need of our charity than the souls in Purgatory?  What hunger, or thirst, or dire sufferings on Earth can compare to their dreadful torments?  Neither the poor, nor the sick, nor the suffering, we see around us, have such an urgent need of our help.  Yet we find many goodhearted people who interest themselves in every other type of suffering, but alas, scarcely one who works for the Holy Souls.

Who can have more claim on us?  Among them too, there may be our mothers and fathers, our friends and near of kin.

When they are finally released from their pains and enjoy the beatitude of Heaven, far from forgetting their friends on earth  their gratitude knows no bounds.  Prostrate before the throne of God, they never cease to pray for those who help them.  By their prayers they shield their friends from many dangers and protect them from the evils that threaten them."

Prayer of St. Gertrude the Great

"Our Lord told St. Gertrude the Great, that the following prayer would release 1000 souls from Purgatory each time it is said."

O 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,

for those in my own home and within my family.

Amen

Source:  Our Lady of the Rosary Library