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The cleansing fire

To the same effect much might he quoted from St. Gregory of Nyssa. The evil man after death will not become “a sharer in the divine nature, till
the cleansing fire shall have removed the stains mingled with the soul” (De mort. 2). And again, “Thus . . . the soul which is united to sin must be set in the fire, so that, that which is unnatural and vile . . . may be removed, consumed by the eternal fire” (De an. 2). Here the eternal fire cleanses.

Source: Thomas Allin – St Gregory of Nyssa quoted in Christ Triumphant