We pray to ease their suffering. We pray that they will soon be ready to enter heaven. Praying that their “purification as through fire” will end soon. And to ask them to pray for us here on earth as well.
It is said that the Holy Souls suffer, but are full of joy, because they know they will soon be with Jesus. They will enter heaven having been purged of the last stain of sin. “Purgatory” is not so much as place, as it is a process of preparation to be with God.