Prayer for All the Faithful Departed
Heavenly Father, I believe that in Your wisdom and justice You willed to purify all persons who die without having attained the state that they need for all eternity, all who have still to expiate completely the sins committed on earth. I also believe that You have mercifully arranged that this process of purification can be aided by the prayers of the living, especially the Eucharist.
Help me to pray for my brothers and sisters who have departed from this world. May their time of purification be short and they be quickly guided into that holy light promised by our Lord to Abraham and his descendents. I offer You sacrifices and prayers of praise. Accept them for all the souls of the faithful departed and admit them all to heavenly joy. Amen.
[From: The Catholic Book of Prayers]