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This doctrine was explicitly taught by St. Gregory of Nyssa, and in more than one passage. It first occurs in his "De animâ et resurrectione" (P.G., XLVI, cols. 100, 101) where, in speaking of the punishment by fire assigned to souls after death, he compares it to the process whereby gold is refined in a furnace, through being separated from the dross with which it is alloyed. The punishment by fire is not, therefore, an end in itself, but is ameliorative; the very reason of its infliction is to separate the good from the evil in the soul. The process, moreover, is a painful one; the sharpness and duration of the pain are in proportion to the evil of which each soul is guilty; the flame lasts so long as there is any evil left to destroy. A time, then, will come, when all evil shall cease to be since it has no existence of its own apart from the free will, in which it inheres; when every free will shall be turned to God, shall be in God, and evil shall have no more wherein to exist. Thus, St. Gregory of Nyssa continues, shall the word of St. Paul be fulfilled: Deus erit omnia in omnibus (1 Corinthians 15:28), which means that evil shall, ultimately, have an end, since, if God be all in all, there is no longer any place for evil (cols. 104, 105; cf. col. 152). St. Gregory recurs to the same thought of the final annihilation of evil, in his "Oratio catechetica", ch. xxvi; the same comparison of fire which purges gold of its impurities is to be found there; so also shall the power of God purge nature of that which is preternatural, namely, of evil. Such purification will be painful, as is a surgical operation, but the restoration will ultimately be complete. And, when this restoration shall have been accomplished (he eis to archaion apokatastasis ton nyn en kakia keimenon), all creation shall give thanks to God, both the souls which have had no need of purification, and those that shall have needed it. Not only man, however, shall be set free from evil, but the devil, also, by whom evil entered into the world (ton te anthropon tes kakias eleutheron kai auton ton tes kakias eyreten iomenos). The same teaching is to be found in the "De mortuis" (ibid., col. 536). Bardenhewer justly observes ("Patrologie", Freiburg, 1901, p. 266) that St. Gregory says elsewhere no less concerning the eternity of the fire, and of the punishment of the lost, but that the Saint himself understood this eternity as a period of very long duration, yet one which has a limit. Compare with this "Contra Usurarios" (XLVI, col. 436), where the suffering of the lost is spoken of as eternal, aionia, and "Orat. Catechet.", XXVI (XLV, col. 69), where evil is annihilated after a long period of time, makrais periodois. These verbal contradictions explain why the defenders of orthodoxy should have thought that St. Gregory of Nyssa's writings had been tampered with by heretics. St. Germanus of Constantinople, writing in the eighth century, went so far as to say that those who held that the devils and lost souls would one day be set free had dared "to instill into the pure and most healthful spring of his [Gregory's] writings the black and dangerous poison of the error of Origen, and to cunningly attribute this foolish heresy to a man famous alike for his virtue and his learning" (quoted by Photius, Bibl. Cod., 223; P.G. CIII, col. 1105). Tillemont, "Mémoires pour l'histoire ecclésiastique" (Paris, 1703), IX, p. 602, inclines to the opinion that St. Germanus had good grounds for what he said. We must, however, admit, with Bardenhewer (loc. cit.) that the explanation given by St. Germanus of Constantinople cannot hold. This was, also, the opinion of Petavius, "Theolog. dogmat." (Antwerp, 1700), III, "De Angelis", 109-111.