There are more souls released from Purgatory during the Consecration of the Mass than at any time. Christmas is the day of the year when most souls are delivered; then feast days of Our Lord, Our Lady and great saints. Souls receive much grace from prayers offered for them on their birthdays, day of baptism, anniversary of death.

The more we work for Poor Souls on earth the more others will pray for us, the more merciful will Christ be with us when we're in Purgatory. Our Lady asked that we pray very much for the poor souls; that we pray:

5 I believe in God
1 Hail Holy Queen 
1 Our Father
1 Hail Mary 
1 Glory be to the Father 
1 Requiem (Eternal rest grant unto them O Lord and let perpetual light shine upon them and may they rest in peace. Amen!)

Our Lady said that if we pray the prayers, "We'll deliver so many souls, so many souls!"

"The Holy wounds are the treasure of treasures for the souls in Purgatory."

2 Machabees 12:46"It is therefore a holy and wholesome thought to pray for the dead, that they may be loosed from sins."