All Saints' Day
The Feast of All Saints' Day on November 1st commemorates the Communion of Saints: The Church Triumphant: those souls have are living in perfect union with God in Heaven, The Church Suffering: those souls who are suffering in Purgatory to cleanse their souls with hellfire with the hope of one day joining the perfected souls in Heaven, The Church Militant: those souls on earth living in the state of Sanctifying Grace who are in their battle against sin.
All Souls' Day
2 Maccabees 11:46
On All Souls' Day we remember the souls suffering in Purgatory. They suffer the purging hellfire of intense suffering. Purgatory is the cleansing place for those who died with venial sin on their souls or those who have not fully made restitution for any sins committed. It is not enough to just confess one's sins, one must also do penance for the forgiven sins.
Prayer for the Holy Souls in Purgatory
Our Lord told St. Gertrude that this prayer would release 1,000 souls from Purgatory each time it was 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.