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Man has the innate capacity to distinguish between good and evil. By his very nature he wants anyone indulging in evil to be punished and anyone doing righteous deeds to be rewarded. It is this consciousness which is called in the Quran the self-reproaching soul or al-nafs al-lawwamah. This faculty bears testimony to the reality of the world of the Hereafter. If, in spite of this inner testimony, an individual does not live up to the highest moral standards, it means that he negates his previously accepted ideals.