Almighty God has created this known world in such a manner that it has become the indicator of the coming unknown world. The material incidents taking shape in this world and the feelings latent in man give information, albeit indirectly about the events that will directly confront man after his death. Among these signs is the capacity to speak. It has been mentioned in a tradition of the Prophet Muhammad, that whatever one receives in the Hereafter will be his own deeds which will be returned to him (‘Indeed, these are your deeds that are returned to you’). In other words, the world of the Hereafter is the double or duplicate of the present world. The capacity of a man to speak is the partial manifestation of this possibility. If a man’s voice is recorded on a tape and if this tape is then played, a voice like the original one may be heard, i.e. the voice of the tape is the double or duplicate of the original. In this way, the phenomenon of voice demonstrates to us on a partial level that event which is going to occur in the Hereafter on a full-scale level.