It is the common judgment of theologians, with St. Augustine, St.Thomas, and St. Bonaventure, that this pain is bitterer than all pain of this life.... Theologians, in common with St. Thomas and St.Bonaventure, teach that the pain of Purgatory is not in any way inflicted by devils. These souls are just and holy. They cannot sin any more; and, to the last, they have overcome the assaults of the devils.
It would not, therefore, be fitting that such souls should be given into their power to be tormented by them. Again, when the devils tempt wayfarers, they do it because they hope to lead them into sin, however perfect they may be; but they could have no such hope about the souls in Purgatory, and so would not be likely to tempt them. Besides, they know that their temptations or harassings would have an effect not intended by them, and would bring the souls from Purgatory to Heaven more quickly.
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It is the common law that souls in Purgatory, during the whole time that they are there, cannot come out from the prison, even if they wish; The constant closing of the prison-doors is a part of the severity of their punishment. So teach St. John Chrysostom, St.Athanasius, and St. Augustine.... The reason for this is the law of the justice of God. The souls of the lost are kept in prison by force and against their will. The souls in Purgatory stay there willingly, for they understand the just will of God and submit to it. This law, however, can be sometimes dispensed with; and so St. Augustine holds it to be probable that there are often true apparitions of the Holy Souls by the permission of God.... It is true that, as a rule, these are apparitions of souls, who, by a special decree of God, are suffering their Purgatory somewhere in this world.... One thing, however, we must note in these cases. When such a permission is given, the pain of the soul is not interrupted. This is not only seen from the visions themselves, but is what reason requires.
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Here occurs the question whether the Holy Souls pray for us and can gain anything for us by merit of congruity, or, at least, impetrate it for us, as others prefer to say. Some have said that they do not thus pray for us, because it is not fitting to their state, in that they are debtors and, as it were, kept in prison for their debts; and also because they do not see God, and so do not know what is done here. They might know such things by special revelations, but revelations of this kind are not due to their state. But surely their penal state does not
necessarily hinder the Holy Souls from praying for, and impetrating for us. They are holy and dear to God; and they love us with charity, remembering us, and knowing, at least in a general way, the dangers in which we live; they understand also how greatly we need the help of God: why, then, should they not be able to pray for us, even though in another way they are paying to God their debt of punishment? For we also in this life are debtors to God, and yet we pray for others....
Besides, we may well believe that the Holy Angels make revelations to the souls in Purgatory about their relatives or friends still living on this earth. They will do this for the consolation of the Holy Souls, or that they may know what to ask for us in particular cases, or that they
may know of our prayers for them.
Source : Purgatory, by Mary Anne Madden Sadlier
'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. Amen.'