"The organic constitution of the Church is not immutable; but Christian society, just as human society, is subject to perpetual evolution."

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That there should be some fire even after this life is not incredible, and it can be inquired into and either be discovered or left hidden whether some of the faithful may be saved, some more slowly and some more quickly in the greater or lesser degree in which they loved the good things that perish, through a certain purgatorial fire.

— Saint Augustine