http://www.newadvent.org/cathen/07207a.htm
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If we abstract from the eternity of its punishment, the existence of hell can be demonstrated even by the light of mere reason. In His sanctity and justice as well as in His wisdom, God must avenge the violation of the moral order in such wise as to preserve, at least in general, some proportion between the gravity of sin and the severity of punishment. But it is evident from experience that God does not always do this on earth; therefore He will inflict punishment after death. Moreover, if all men were fully convinced that the sinner need fear no kind of punishment after death, moral and social order would be seriously menaced. This, however, Divine wisdom cannot permit. Again, if there were no retribution beyond that which takes place before our eyes here on earth, we should have to consider God extremely indifferent to good and evil, and we could in no way account for His justice and holiness.-Nor can it be said: the wicked will be punished, but not by any positive infliction: for either death will be the end of their existence, or, forfeiting the rich reward of the good, they will enjoy some lesser degree of happiness. These are arbitrary and vain subterfuges, unsupported by any sound reason; positive punishment is the natural recompense of evil. Besides, due proportion between demerit and punishment would be rendered impossible by an indiscriminate annihilation of all the wicked. And finally, if men knew that their sins would not be followed by sufferings, the mere threat of annihilation at the moment of death, and still less the prospect of a somewhat lower degree of beatitude, would not suffice to deter them from sin."
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Yes, if torments are not eternal. I think it is the eternal part which is ripping my conscience apart on this problem.
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"The Church professes her faith in the eternity of the pains of hell in clear terms in the Athanasian Creed (Denz., nn. 40), in authentic doctrinal decisions (Denz, nn. 211, 410, 429, 807, 835, 915), and in countless passages of her liturgy; she never prays for the ******. Hence, beyond the possibility of doubt, the Church expressly teaches the eternity of the pains of hell as a truth of faith which no one can deny or call in question without manifest heresy."
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I don't want to be a heretic, but how is eternal torment, just? And why allows those to be born that would choose to be tormented forever, if God loves them in the first place and does not desire them to be condemned?